Discussion about math, puzzles, games and fun. Useful symbols: ÷ × ½ √ ∞ ≠ ≤ ≥ ≈ ⇒ ± ∈ Δ θ ∴ ∑ ∫ π -¹ ² ³ °

You are not logged in.

- Topics: Active | Unanswered

Pages: **1**

**jhp****Member**- Registered: 2005-09-20
- Posts: 2

Hi,

I have one problem and I don´t know can this be solved?

What is the formula of this mathematical problem:

This is like golf handicap 54 is worst and 0 great.

54-0. So if X goes higher solution gets lower.

If values are these

X=1712*60%

Y=56*30%

Z=21*10%

Solution for these numbers=21,4

another example for different numbers for same formula problem:

X=1112*60%

Y=36*30%

Z=22*10%

Solution for these numbers=35,7

Offline

**kylekatarn****Member**- Registered: 2005-07-24
- Posts: 445

Could you reformulate the question?

Offline

**MathsIsFun****Administrator**- Registered: 2005-01-21
- Posts: 7,535

What you are talking about is an "inverse relationship".

For Example, if 54 was the worst and is worth 0% and 0 is the best and is worth 100% you **could** have:

x = 0% to 100%

y = 54 to 0

x = (54-y)/54

So, if y=10, then x=(54-10)/54 = 81.5%

Or, if y=50, then x=(54-50)/54 = 7.4%

But there are different solutions that acheive a similar result. In the case I just showed you there is a straight line between the values, ie linear. But maybe you have a curve or something in between. As kyle said, you can give us more data if you want.

(I understand that when you write "21,4" it means "21.4" in the UK/US am I right?)

"The physicists defer only to mathematicians, and the mathematicians defer only to God ..." - Leon M. Lederman

Offline

**jhp****Member**- Registered: 2005-09-20
- Posts: 2

Hi,

Yes I mean 21,4 is same as 21.4.

These X, Y and Z values have different importance to result (X=60%, y=30%, Z=10%)

Now I´m missing the formula. I know numbers and final result. Both of these cases uses same formula. I know that it has something to do with golf handicap calculation. If X value gets higher then Result gets smaller. Can this be solved using these numbers?

case1

X=1712 x 60%

Y=56 x 30%

Z=21 x 10%

Result=21.4

case2

X=1112 x 60%

Y=36 x 30%

Z=22 x 10%

Result=35.7

Offline

**MathsIsFun****Administrator**- Registered: 2005-01-21
- Posts: 7,535

There aren't enough equations to solve it, I think, but ...

If you just combine the numbers:

1712 x 60% + 56 x 30% + 21 x 10% = 1027.2 + 16.8 + 2.1 = 1046.1

1112 x 60% + 36 x 30% + 22 x 10% = 667.2 + 10.8 + 2.2 = 680.2

Then we could have:

f(x) = y

f(1046.1) = 21.4

f(680.2) = 35.7

The function f(x) in this case **could be**: 35.7 - (x-680.2)*(14.3/365.9)

So, when x = 1046.1, then y = 35.7 - (1046.1-680.2)*365.9 = 35.7 - (1046.1-680.2)*(14.3/365.9) = 35.7 - 14.3 = 21.4

And, when x = 680.2, then y = 35.7 - (680.2-680.2)*365.9 = 35.7 - 0 = 35.7

But I don't know how to treat the X, Y and Z separately. If you had a few more equations, we could maybe do a better job.

"The physicists defer only to mathematicians, and the mathematicians defer only to God ..." - Leon M. Lederman

Offline

Pages: **1**