Question

The perimeter of a parallelogram is 140 cm. If one of the sides is longer than the other by 10 cm,find the length of each of its sides.

Answer 1

Given that one of the sides is longer than the other by $10cm$ and let it be $x$ and $x+10$
Also given that its perimeter is $140cm$
But we know that perimeter $=2(length+width)=2(x+(x+10\left)\right)$
$140=2(2x+10)$
$140=4x+20$
$140-20=4x$
$x=120/4=30$
$x=30cm$
$x+10=40cm$
Therefore the side are $30cm$ and $40cm$.