Maths Problem

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Discussion

JontyR

Original Poster:

1,924 posts

179 months

Friday 27th December 2024
quotequote all
I hope this is in the correct area, it is quite techy...well hopefully! rofl

Bear in mind it is designed for an 11 year old, but it has stumped me and I have tried many different ideas.

10 is to 24
18 is to 120
13 is to ?

I am prepared to get my coat if it is really obvious!!

g4ry13

19,135 posts

267 months

Friday 27th December 2024
quotequote all
52.5

according to Chat GPT which I suspect has overly complicated the matter biggrin

JontyR

Original Poster:

1,924 posts

179 months

Friday 27th December 2024
quotequote all
I tried ChatGPT too, mainly to save the embarrassment.

I have tried time, weights, dozens. Factorials
10 equals 1 plus 2 plus 3 plus 4
24 equals 1 times 2 times 3 times 4

(would have used symbols but i keep getting a 403 error)

But it doesnt work after that!

JontyR

Original Poster:

1,924 posts

179 months

Friday 27th December 2024
quotequote all
There are possible answers of
50, 64, 68, 58 or 60

TonyRPH

13,235 posts

180 months

Friday 27th December 2024
quotequote all
According to Gemini (Google's AI) the answer is 60.

AI said:
10 is to 24: It's not a simple multiplication or addition. Let's consider 10 * (10/4 + 1.4) = 10 * 3.9 = 39 which isn't 24. Let's try another approach. 10 * 2 + 4 = 24.
18 is to 120: 18 * 6 + 12 = 120.

It looks like the pattern is: multiply the first number by a value and add another value. However the multiplier is not consistent.

Let's try a different approach.

10 is to 24: We can express 24 as 10 * 2.4.
18 is to 120: We can express 120 as 18 * 6.666... (or 6 and 2/3).

This doesn't seem to reveal a clear pattern either.

Let's look at the differences:

24 - 10 = 14
120 - 18 = 102

This also doesn't give us a clear pattern.

Let's consider squares:

10 and 24: 10<sup>2</sup> = 100 which is nowhere near 24
18 and 120: 18<sup>2</sup> = 324 which is nowhere near 120

Let's try a different approach. Let's look at the ratio between the numbers:

24 / 10 = 2.4
120 / 18 = 6.666...

These ratios don't seem related.

Let's try to express the second number as a function of the first:

24 = f(10)
120 = f(18)

If we consider f(x) = x * (x/4 + some constant)

10 * (10/4 + c) = 24 => 25 + 10c = 24 => 10c = -1 => c = -0.1
18 * (18/4 + c) = 120 => 81 + 18c = 120 => 18c = 39 => c = 2.166...

This doesn't work.

Without a clear and consistent pattern, it's impossible to definitively determine the corresponding number for 13. The problem as stated is likely flawed, missing information, or relying on a complex pattern that is difficult to deduce with only two examples.

If we assume a simple linear relationship of the form y = ax + b, we have two equations:

24 = 10a + b
120 = 18a + b

Subtracting the first from the second:

96 = 8a
a = 12

Substituting back into the first equation:

24 = 120 + b
b = -96

So y = 12x - 96

If x = 13, then y = 12 * 13 - 96 = 156 - 96 = 60

So, if we assume a linear relationship, 13 would correspond to 60. However, without more information, this is just one possibility.

Final Answer: The final answer is 60​

JontyR

Original Poster:

1,924 posts

179 months

Friday 27th December 2024
quotequote all
Oh god.. I wrote out a number of equations but rather than go with the obvious one I started trying to use different factors

Thank you!

getmecoat

Narcisus

8,427 posts

292 months

Friday 27th December 2024
quotequote all
42

Super Sonic

8,771 posts

66 months

Friday 27th December 2024
quotequote all
When your kid hands in their homework, do they have to show the workings?

g4ry13

19,135 posts

267 months

Friday 27th December 2024
quotequote all
TonyRPH said:
According to Gemini (Google's AI) the answer is 60.

AI said:
10 is to 24: It's not a simple multiplication or addition. Let's consider 10 * (10/4 + 1.4) = 10 * 3.9 = 39 which isn't 24. Let's try another approach. 10 * 2 + 4 = 24.
18 is to 120: 18 * 6 + 12 = 120.

It looks like the pattern is: multiply the first number by a value and add another value. However the multiplier is not consistent.

Let's try a different approach.

10 is to 24: We can express 24 as 10 * 2.4.
18 is to 120: We can express 120 as 18 * 6.666... (or 6 and 2/3).

This doesn't seem to reveal a clear pattern either.

Let's look at the differences:

24 - 10 = 14
120 - 18 = 102

This also doesn't give us a clear pattern.

Let's consider squares:

10 and 24: 10<sup>2</sup> = 100 which is nowhere near 24
18 and 120: 18<sup>2</sup> = 324 which is nowhere near 120

Let's try a different approach. Let's look at the ratio between the numbers:

24 / 10 = 2.4
120 / 18 = 6.666...

These ratios don't seem related.

Let's try to express the second number as a function of the first:

24 = f(10)
120 = f(18)

If we consider f(x) = x * (x/4 + some constant)

10 * (10/4 + c) = 24 => 25 + 10c = 24 => 10c = -1 => c = -0.1
18 * (18/4 + c) = 120 => 81 + 18c = 120 => 18c = 39 => c = 2.166...

This doesn't work.

Without a clear and consistent pattern, it's impossible to definitively determine the corresponding number for 13. The problem as stated is likely flawed, missing information, or relying on a complex pattern that is difficult to deduce with only two examples.

If we assume a simple linear relationship of the form y = ax + b, we have two equations:

24 = 10a + b
120 = 18a + b

Subtracting the first from the second:

96 = 8a
a = 12

Substituting back into the first equation:

24 = 120 + b
b = -96

So y = 12x - 96

If x = 13, then y = 12 * 13 - 96 = 156 - 96 = 60

So, if we assume a linear relationship, 13 would correspond to 60. However, without more information, this is just one possibility.

Final Answer: The final answer is 60?
I see your Gemini and raise you with Chat GPT biggrin

Chat GPT said:
To find the relationship between the numbers, let's analyze the pattern.

1. **First pair: \(10 \to 24\)**
- A possible operation: \(10 \times 2 + 4 = 24\).

2. **Second pair: \(18 \to 120\)**
- A similar operation might apply: \(18 \times 6 + 12 = 120\).

Let’s determine a rule:
- Multiply the first number by a factor, then add a number.
- The factor and addition might depend on the input.

Let’s check if this reasoning applies consistently.

---

  1. # Testing the Rule for \(13 \to ?\):
If the factor grows linearly with the input number:
- For \(10 \to 24\), the factor is \(2.4\) (\(24/10\)).
- For \(18 \to 120\), Factor Logical ** Apply

Let's identify a clear pattern:

1. For \( 10 \to 24 \):
\( 10 \times 2 + 4 = 24 \).

2. For \( 18 \to 120 \):
\( 18 \times 6 + 12 = 120 \).

The multiplication factor increases with the input, and the addition follows a pattern. Let’s analyze this systematically.

---

  1. # Step-by-Step:
1. The multiplier seems proportional:
- \( 10 \to 2 \),
- \( 18 \to 6 \).

**Assumption**: The multiplier might grow linearly with the input.

2. The addition term:
- \( 4 \) for \( 10 \),
- \( 12 \) for \( 18 \).

This also increases.

---

For \( 13 \):
1. Interpolating the multiplier:
- \( 10 \to 2 \),
- \( 18 \to 6 \).

Slope = \( \frac{6 - 2}{18 - 10} = \frac{4}{8} = 0.5 \).
At \( 13 \): \( 2 + (13 - 10) \times 0.5 = 2 + 1.5 = 3.5 \).

Multiplier = \( 3.5 \).

2. Interpolating the addition:
- \( 4 \) for \( 10 \),
- \( 12 \) for \( 18 \).

Slope = \( \frac{12 - 4}{18 - 10} = 1 \).
At \( 13 \): \( 4 + (13 - 10) \times 1 = 4 + 3 = 7 \).

Addition = \( 7 \).

---

  1. # Final Calculation:
\[ 13 \to (13 \times 3.5) + 7 = 45.5 + 7 = 52.5. \]

  1. # Answer:
52.5

essayer

10,038 posts

206 months

Friday 27th December 2024
quotequote all
(n-8) * 12

so 13 is to (5*12) = 60



Edited by essayer on Friday 27th December 18:18

TonyRPH

13,235 posts

180 months

Friday 27th December 2024
quotequote all
g4ry13 said:
And this is what I got out of ChatGPT (which initially couldn't detive anything).

There were more calculations, but good old PH barfed on the post, so I had to summarise.

GPT said:
To determine mm and nn for 1313, observe that mm and nn increase with xx. Let's interpolate their values:
Interpolating mm and nn for 1313:

Using a linear relationship:
m=2+6?218?10?(13?10)=2+48?3=2+1.5=3.5
m=2+18?106?2??(13?10)=2+84??3=2+1.5=3.5
n=4+12?418?10?(13?10)=4+88?3=4+3=7
n=4+18?1012?4??(13?10)=4+88??3=4+3=7
Calculate for 1313:
13?(13×3.5)+7=45.5+7=52.5
13?(13×3.5)+7=45.5+7=52.5

Since 52.5 is not an option, we round to the nearest value, which is 50.
Final Answer:

50
EDIT: here's a screenshot of the calcs.



Edited by TonyRPH on Friday 27th December 18:37

OutInTheShed

10,619 posts

38 months

Friday 27th December 2024
quotequote all
essayer said:
(n-8) * 12

so 13 is to (5*12) = 60



Edited by essayer on Friday 27th December 18:18
If you graph the data points you have, there are an infinite number of curves which are 'solutions', so the third point can be anything you like.

But the simplest solution is a straight line.

If you've got 3 arbitrary data points, the simplest solution might involve x^2 terms.

There are unlimited possibilities, the 'answer' might be anything from ASCII character values in a string of text through to car registrations.
It reeks of either a question set by a 'teacher' with a poor grasp of fundamental maths, or the question being munged between being asked and the OP getting hold of it.

Radec

4,776 posts

59 months

Friday 27th December 2024
quotequote all
That question is for an 11 year old?

Looks like the final question you'd get on the 1% Club gameshow.

Think im going to be in trouble when my lad grows up and needs help with his homework lol.

essayer

10,038 posts

206 months

Friday 27th December 2024
quotequote all
I suspect there is context around the question that the 11 year old spent a whole maths lesson listening to but has chosen not to relay that to their parent smile

That’s what my kid does anyway!

The_Nugget

702 posts

69 months

Friday 27th December 2024
quotequote all
Radec said:
That question is for an 11 year old?

Looks like the final question you'd get on the 1% Club gameshow.

Think im going to be in trouble when my lad grows up and needs help with his homework lol.
You are not wrong. My daughter is 13…her maths homework is on a website, there is a video if you are struggling to explain it…I get ‘her’ to watch that so I can see it and then explain it to her!

V8LM

5,346 posts

221 months

Saturday 28th December 2024
quotequote all
OutInTheShed said:
If you graph the data points you have, there are an infinite number of curves which are 'solutions', so the third point can be anything you like.

But the simplest solution is a straight line.

If you've got 3 arbitrary data points, the simplest solution might involve x^2 terms.

There are unlimited possibilities, the 'answer' might be anything from ASCII character values in a string of text through to car registrations.
It reeks of either a question set by a 'teacher' with a poor grasp of fundamental maths, or the question being munged between being asked and the OP getting hold of it.
Indeed. If the relationship was a quadratic of formula y = ax^2 + bx + c, then you can get any answer n using a = 4 - n/15, b = 28n/15 - 100, and c = 624 - 12n.

If the relationship was y = 1 / (13 - x) + 181/15 x - 97, there is no solution when x = 13.

The Moose

23,271 posts

221 months

Saturday 28th December 2024
quotequote all
Is it something to do with different bases?

zetec

4,724 posts

263 months

Saturday 28th December 2024
quotequote all
Super Sonic said:
When your kid hands in their homework, do they have to show the workings?
Just print out this webpage.

rdjohn

6,629 posts

207 months

Monday 30th December 2024
quotequote all
Perhaps the teacher posed a question that AI would find difficult to answer.

This is the thinking of my 73-year old brain that has been retired from work for 20-years. It is about number of characters and number progression.

TWENTY FOUR = 10(c) – 0 = 10

ONE HUNDRED AND TWENTY = 19(c) – 1 = 18

THIRTEEN = 8(c) -2 = 6

AI never tries to think outside the box, it “knows what it knows” and can think quickly - so it can be taught to look out for tricks like this in the future.


vaud

54,035 posts

167 months

Monday 30th December 2024
quotequote all
That’s pretty advanced for y7…