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

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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**bobbym****Administrator**- From: Bumpkinland
- Registered: 2009-04-12
- Posts: 94,460

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.**

**If it ain't broke, fix it until it is.**

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