A room is 20m long, 15m wide and 12m high. It contains a door 7.5m × 4m and two windows of size 4m × 2.5m. Find the cost of painting its wall @ rs. 15 per m2
Answers
Explanation:
length of room=20m
breadth of room=15m
height of room =12m
C.S.A = 2 ( l + b)h
= 2 (20m+15m)12m
=2 ×35m×12m
=70m ×12m
=840m^2
length of door=7.5m
breadth of door=4m
area of door=length×breadth
=7.5m×4m
=30m^2
length of window =4m
breadth of window =2.5m
area of window = length × breadth
= 4m×2.5m
=10.0m^2
area of 2 Windows = 2× 10.0m^2
=20.0m^2
area of wall= area of room - (area of door +area of window)
=840m^2-(30m^2+20m^2)
=840m^2- 50m^2
=790m^2
cost of painting a m2 = Rs.15
cost of painting 790m2=790×Rs. 15
= Rs.11850
Explanation:
Explanation:
length of room=20m
breadth of room=15m
height of room =12m
C.S.A = 2 ( l + b)h
= 2 (20m+15m)12m
=2 ×35m×12m
=70m ×12m
=840m^2
length of door=7.5m
breadth of door=4m
area of door=length×breadth
=7.5m×4m
=30m^2
length of window =4m
breadth of window =2.5m
area of window = length × breadth
= 4m×2.5m
=10.0m^2
area of 2 Windows = 2× 10.0m^2
=20.0m^2
area of wall= area of room - (area of door +area of window)
=840m^2-(30m^2+20m^2)
=840m^2- 50m^2
=790m^2
cost of painting a m2 = Rs.15
cost of painting 790m2=790×Rs. 15