Question

Length of a rectangle is 30 m and its breadth is 20 m. Find the increase in its area if its length is increased by 10 m and its breadth is doubled.

Answer 1

Length of a rectangle (l) = 30 m,

Breadth of the rectangle (b) = 20 m

Area of rectangle = l x b 

= 30 x 20 = 600 m²

Since, the length its increased by 10 m and breadth is doubled

∴New length (l) = (30 + 10) m = 40 m

and new breadth = (20 x 2) m = 40 m

∴New area = l x b = 40 x 40 m² = 1600 m²

Hence, the increase in the area = (1600 – 600) m²

= 1000 m²