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Question

The cost of papering the four walls of a room 12m long at Rs.6.50 per square metre is Rs.1638 and the cost of matting the floor at Rs.3.50 per square metre is Rs.378. Find the height of the room.

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Solution

length of room (l)=12m
area of floor =l×b=12×b

Total cost of matting floor =12×b×3.50=378
42b=378
b=9m

Area of walls of the room =2h(l+b)
=2h(12+9)
=42hm2

Total cost of papering walk =42h×6.50=1638
273h=1638
h=6m.

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