Question

A hall is 36 metre long and 24 metre broad and 940 square metres for doors and windows the cost of papering the walls rupees 8.40 per square metre is rupees 4704 find the height of the hall​

Answer 1

Step-by-step explanation:

Area excluding door and windows=4704/8.40=560m²

Total area=560 + 940 = 1500m²

Area of walls=2(36*h)+2(24*h)=2{36*h+24*h}=2(60*h)=120*h

1500=120*h

h=1500/120

Height is equal to 12.5m

Answer 2

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length of hall = 36 m

and breadth of hall = 24 m

Let 'h' be the height of the hall.

Now, in papering the wall, we need to paper the four walls excluding floor and roof of the hall.

So, area of wall which is to be papered = lh + bh + lh + bh = 2h(l + b)

= 2h (36 + 24) = 120 h m2

Now, area leaves for door and windows = 80 m2

So, the area which is actually papered = (120h- 40) m2

Again, the cost of papering the walls at Rs 8.40 per m2 is equal to Rs 4704

(120h - 40)* 8.4 =  4704

120h - 40 = 560

120 h = 560 +40

120h=600

h = 5

The height of the hall is 5m .