Question

Two rectangles have the same width. one is 12 units long and the other is 8 units long. the area of the first rectangle is 320 square units more than the area of the second rectangle. find the width of each rectangle.

Answer 1

let width be X
atq.
we know that
at. of rect.=l×b
$12x = 320 + 8x \\ 12x - 8x = 320 \\ 4x = 320 \\ x = \binom{320}{4 \ } \\ x = 8$