Question

21. 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​

Answer 1

Answer:

1960

Step-by-step explanation:

his equation is not in doors or windows but these answer you will get 100 marks

Answer 2

Answer:

height is 10m

Step-by-step explanation:

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)=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.

hope it helps you