When a problem has only letters how are you suppose to solve it? ?

Question

In the previous problem Q I asked about there was at least 1 number,

in this one, y=lwh for w. There isn't any.

How am I suppose to know how to set it up, or anything?

Answer 1

"Solve for w" means "get w all by itself on one side of the equation".  Sometimes that means you get w equal to a number, other times you can't get that far.

Divide both sides by lh

y/(lh)=w

_/