Question

The cost of paper is Rs. 55 per
kg. If one kg of paper covers an
area of 192 m2, what will be the
cost in covering a cube of edge 8
metre?
(1) Rs. 110
(2) Rs. 165
(3) Rs. 55
(4) Rs. 192​

Answer 1

Answer:

Given, cost of papering the wall is Rs 3150 at Rs 14 per sq. m. Height of the room is 5m and length and breadth are in ratio 4:1.

Area of wall to be papered=

rateofpaperingpermeter

costofpaperingthewall

=

14

3150

=225m

2

The height of wall=5 cm. Let the length of the wall be 4x and breadth be x.

Surface area of four walls=2h(l+b)

or,225=2×5(4x+x)

or,225=10(5x)

or,225=50x

or,x=4.5

Length of wall=4x=5×4.5=18m.

Breadth of wall=x=4.5m