Question

a)
A room is twice as long as it is broad and its height is 4.5 m. If the cost of papering its walls at Rs 15 per sq. metre is Rs 2430, find the cost of paving marbles on its floor at Rs 150 per sq. metre.​

Answer 1

Answer:

Given L = x

B= 2x

H= 4.5

Now,

Cost of papering wall c = Rs 2430

Rate of papering wall R = Rs 15 sq meter

Area of walls = C/R

or, 2h (l+b) = 2430/15

or, 2* 4.5 ( x + 2x ) = 162

or, 9 * 3x = 162

or, 27x = 162

therefore x = 6

Again,

L = 6 and B = 12

Now again to find Area of floor: R = RS 150

L * B = 6 * 12 = 72 meter

Now cost of paving marble is A * R

72 * Rs 150 = RS, 10,800