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.

Let x be the common multiple.

According to question, sides will be x and (x + 10).

Perimeter =

140 = 2 (x + (x + 10))

140 = 2 (2x + 10)

140 = 4x + 20

4x = 120

X =30 cm

X + 10 = 40 cm

So, sides will be 30 cm and 40 cm.