Question

the Length breadth and height of a room are 5 M 4 m and 3 M respectively find the cost of whitewashing the inner of the room and sealing at the rate rupees 50 per square metre

Answer 1

l = 5m
b = 4m
h = 3m

Area of inner room with ceiling =
$2(bh + hl) + lb \\ = 2(4 \times 3 + 3\times5) + 5 \times 4 \\ = 2(12 + 15) + 20 \\ = 2(27) + 20 \\ = 54 + 20 \\ = 74 {m}^{2}$
Cost of whitewashing 1 sq. m = 50

Cost of whitewashing 74 sq. m =

74×50

= Rs3700

Hope it helps.

If you satisfied mark it brainliest.