Question

A hall 36 m long and 24 m broad allowing 80 m for doors and windows, the cost of papering the walls at 8.40 per sq. metre is 9408. Find the height of the hall ? answer the question
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Answer 1

Answer:

Length of hall = 36 m ; breadth of hall = 24 m 

Let 'h' be height of the hall

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

so area of wall which is to be papered 

=lh+bh+lh+bh=2h(l+b)=2h(36+24)=120hm2

Now area leaves for doors and windows =80m2

so the area which is actually papered =(120h−80)m2

Again cost of papering the walls at Rs. 8.40 per m2

is equal to Rs 9408.

(120h−80)×8.4=9408

120h−80=1120⇒120h=1200⇒h=10m.

Step-by-step explanation:

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