Question

Find the cost of painting the wall of a room at RS 25 per square metre if length, breadth and height of the room as 6m, 4m and 2.5m respectively

Answer 1

In a cuboid shaped room,
length = 6m
breadth = 4m
height = 2.5m

surface of painting the room = total surface area of the room

total surface area of the room = 2( lb * bh * lh )
= 2( 6 * 4 + 4 * 2.5 + 6 * 2.5 )
= 2( 24 + 10 + 15)
= 2(25 + 24)
= 2 * 49
= 98 sq meter

cost of painting = RS 25 per sq meter
therefore, cost of painting the room
= 25 * total surface area of the room
= 25 * 98
= 2450

ans -. Cost of painting the room is RS 2,450