Question

The cost of white-washing the walls of a room 20 m
long and 8 m high at Rs. 15 per sq. metre is Rs. 7200.
The cost of carpeting the room at Rs. 27-50 per sq.
metre is​

Answer 1

Answer:

surface area of a cuboid is 2(LB*HB*HL)

and B is not given.

but if we take 5 walls the formula should be

2(LB+BH+LH)-(LB)*15

7200=2(20B+160+8B)-(8B)*15

240 = 28B+160-8B

80 = 20B

B = 4m

now,

cost of carpeting room

we will take average of cost of carpeting

27+50/2= 38.5

then,the cost will be

=8*4*38.5

=1232 Rs.

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