Question

if the perimeter of a rectangle is 60 cm and its is 10 cm wide find its length

Answer 1

perimeter of rectangle = 2( l+ b)
= 60 cm
2 ( l+ b ) = 60
l + b = 30
l + 10 = 30
l = 30 - 10
l = 20 cm

Answer 2

perimeter of a rectangle=2(l+b)

60cm=2(l+10cm)
60cm=2l+20cm
60cm-20cm=2l
40cm=2l
40/2=l
20=l

$<marquee><b><h><i>the length of the rectangle is 20 cm$