Question

The perimeter of a rectangle is 24cm. If the length in y cm, what is the width?

Answer 1

perimiter=2 times (length+width)
if perimiter=24

24=2(L+W)
divide both sides by 2
12=L+W

if L=y then
12=y+W
minus y from both sides
12-y=W

the width is 12-y cm