Question

A class room is 7 m long, 6.5 wide and 4 m high. It has one door 3m× 1.4 and three windows each measuring 2m×1m. The interior walls are to be color-washed. The contractor charges rs.15 per sq.m. Find the cost of colour washing.

Answer 1

Answer is in the above attachment

Answer 2

Step-by-step explanation:

GIVEN :-

length of classroom = 7 m

breadth of classroom = 6.5 m

height of classroom = 4 m

Now ,

→ area of door = 3 × 1.4 m

→ 4.2 m²

Now ,

→ area of windows= 3 × 2 × 1

→ 6 m²

→ lateral surface area of classroom

→ 2 (l+b) × h

→ 2( 7 + 6.5 ) × 4

→ 2(13.5) × 4

→ 108 m²

→ Now , area to be painted

→ 108 - 4.2 + 6

→ 108 - 10.2

→ 97.8 m²

Now , cost = 15 × 97.8

→ ₹ 1467