Question

Find the breadth if perimeter is 120cm and length is 50cm

Answer 1

Answer:

$perimeter = sum \: of \: all \: sides \: of \: a \: polygon \\ perimeter \: of \: rectangle = 2(l+b) \\ from \: the \: question \: \\ 120 = 2(50+x) \\ 120 = 100+2x \\ 120-100=2x \\ 20 = 2x \\ x = \frac{20}{2} \\ x=10 \\ breadth = 10 cm$