Question

The area of a rectangle with length l and width w can be calculated using the formula A = lw.
How can the formula be written to easily find the length of a rectangle if you already know the rectangle's area and width?

Answer 1

Start with A = l w. Divide both sides by w (assuming w ≠ 0) to isolate l:

l = A / w.

So the length equals the area divided by the width.