the central hall of school is 80m long and 8m high. It has 10 doors each of size 3m x 1.5m and 10 windows each of size 1.5x1m. If cost of white -washing the walls of the hall at the rate of Rs 1.20 per m2 is 2385.60 , find the breadth of the hall.
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Answer:
Step-by-step explanation:
Lateral area= total cost÷cost per square metre
2385.6 ÷ 1.2 = 1988
Hence, LTA= 1988+60 (Area of doors and windows)
=2048m^2
breadth=
2048=2(l+b)h
1024=640+8b
384=8b
b=48 m
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