Question

11. The dimensions of a room are 12.5 m by 9 m by 7 m.
There are 2 doors and 4 windows in the room; each door
measures 2.5 m by 1.2 m and each window 1.5 m by 1 m.
Find the cost of painting the walls at * 3.50 per square
metre.
​

Answer 1

Answer:

1020.25rs

Step-by-step explanation:

As we know that area of 4 walls of room is

=> 2(h×b) + 2(h×l)

bcoz height is common in all the walls so

=> let length is 7 meter so

=> 2(12.5×7) +2(9x7)

=> 175+126

=> 301m²

=> but there are two doors and 4 windows so

=> area will be subtracted

=> 2(2.5×1.2)+4(1.5×1)

=> 3.6+6

=> 9.6 m²

=> total area left is => 301-9.6 = 291.4

=> now we know that cost of painting per m² = 3.50

=> so total cost is => 291.4×3.50

=> 1020.25