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$A = 1000, B = 1.2$

$A\times B = C (1000\times 1.2 = 1200)$

$X\times C = A (? \times 1200 = 1000)$

Need to find $X$ every time I change $A$ or $B$. Probably there is formula that is able to solve this since the only way I know how to do it is hilariously ignorant and slow.

How do i ask a calculator to do that (: ? Preferably one with syntax I can use with Excel or google.

Thx in advance.

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2 Answers 2

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Use algebra: $X=A/C = A/(A \cdot B) = 1/B$.

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  • $\begingroup$ Yeah, thank you for that, I'd almost be embarrassed to ask, except math was never my vocation, life just tends to amuse it self by giving me odd math obstacles here and there. $\endgroup$
    – helena4
    Jun 30, 2014 at 9:01
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If $$x\cdot c = a,$$ then $$x = \frac{a}{c}.$$

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