Question

The length, width and height of a room are 15 m, 10 m respectively. And 5 m,. If length, width and height
Each is increased by 10%, but let us calculate the percentage increase in the area of ​​the four walls.​

Answer 1

Area of roof = (l * b) = (20 * 15) square metres = 300 square metres.

Area of four walls = {2 * (l + b) * h} = {2 * (20 + 15) * 10} square metres = (2 * 35 * 10) square metres = 700 square metres.