Question

length of a classroom is two times its height and weight is a 3 by 2 times its height the cost of whitewashing the walls at the rate of RS 1,000 find the cost of tiling the floor at the rate of 20 rupees per square metre

Answer 1

let height be X

length = 2X
width = 3/2 X

cost of whitewashing walls = Rs 1000 = whitewashing CSA
rate of whitewashing walls = Rs 20 / sq.m.

area of walls = 1000/20 = 500 sq.m.

csa = 2h(l+b)
500= 2*X(2X + 3/2X)
X = 500/7 m = h

2X = 2*500/7=1000/7 m = l

3/2 X = 3/2 * 500/7 = 750/7 m = b