Question

17. A hall has four walls, each measuring 11.5 m * 7.2 m. It has two doors of height
width 1 m. It also has three windows of size 1 mx 0.5 m. Find the cost of whitewach
the walls at the rate of 65 per square metre​

Answer 1

Answer:

cost of whitewashing is 5154.5 ₹

Step-by-step explanation:

area of four walls

= lxb

=11.5 m x 7.2 m

= 82.8 sq mt

area of 2 doors

= lxb x 2 doors

= 1x1 x 2

= 2 sq m

area of 3 windows

= lxb x 3 windows

=1 x 0.5 x 3

= 1.5 sq m

area to be whitewashed

= area if four walls - area if doors - area of windows

= 82.8 -2 -1.5

= 79.3 sq m

cost of whitewashing

= 79.3 x 65 ₹

= 5154.5 ₹