Question

A hall 36 m long and 24 m broad allowing 80 m2 for doors and windows, the cost of papering
the walls at Rs 8.40 per m² is Rs 9408. Find the height of the hall.​

Answer 1

Answer:

10m

Step-by-step explanation:

so area of wall which is to be papered

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

2

Now area leaves for doors and windows =80m

2

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

2

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

2

is equal to Rs 9408.

(120h−80)×8.4=9408

120h−80=1120⇒120h=1200⇒h=10m.