Question

A room is twice
as long as its breadth and it's
height is
4.5 m. If the cost of papering it's walls
at Rs. 15 per sq meter is Rs. 2430. Find the cost of
paving marbles on its floor at Rs. 150
per square
meter.



​

Answer 1

Answer:

soln,

here,

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

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