Question

the Central Hall of a school is metre long and 15m high. it has 10 doors each of size 4 metre*2 metre and 10 Windows each of size 1.5 metre*2 metre. if the cost of whitewashing the walls of the hall @ rupees 1. 40 per metre square is rupees 6986.find the breadth of the hall​

Answer 1

Step-by-step explanation:

central hall of school is what meter long

Answer 2

Answer:

Breadth of hall is 8 meters.

Step-by-step explanation:

Since we are white washing the Central hall. Consider only inner walls. Outer walls belong to another room.

l = 80 m

b = b m

h = 8 m

Total area to white wash = Total surface area - floor - Windows and doors area.

= (2*lb + 2*lh + 2*bh) - lb - Windows and doors area.

Windows and doors area = 10*(3*1.5) + 10*(1.5*1) = 60 Square meters.

Total area to white wash = (80b+1280 + 16b) - 60 = 96b+1220.

Total Cost of whitewash = Whitewash area * per Square meter price

2385.6 = (96b + 1220)*1.2

2385.6 = 115.2b + 1464

115.2b = 921.6

b = 8 meters.

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