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## #1 2014-03-26 02:42:23

khazaymeh
Member
Registered: 2014-03-26
Posts: 1

### bulding a formula from three assumptions

Hi, I am beginner in mathematics , I have the following three relationships:
a=b
c=d
a-b=c-d

I need to calculate c under the assumption that a, b and d are known values.
I got c=a-b+d
and c=a/b*d

can I use any other formulas?!!

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## #2 2014-03-26 02:50:04

bobbym
From: Bumpkinland
Registered: 2009-04-12
Posts: 88,727

### Re: bulding a formula from three assumptions

Hi;

c=a/b*d is not true.

Unless you mean

That is generally not true but given your conditions...

In mathematics, you don't understand things. You just get used to them.

I agree with you regarding the satisfaction and importance of actually computing some numbers. I can't tell you how often I see time and money wasted because someone didn't bother to run the numbers.

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