Another mid level math question about %. $A = 1000, B = 0.6$ $Y \times B = A ; (? \times 0.6 = 1000)$ Need to find $Y$ every time I change $A$ or $B$. How do i ask a calculator to do that (: ? (I managed to reverse engineer a way from another answer by René Richter - which is) $(1 / B) \times A$ Any other obvious ways to calculate this that I'm missing? Yes i know its probably pitiful, but a headache and silly math skills only get so far ... Thx in advance. Thx in advance.

I'm not very sure what you are trying to accomplish here:

if $$Y = A/B $$

Then if you change B, simply divide it by your value of A to find Y.

Similarly if you change A, you would follow the same process.