A room is 9 metre by 8 metre by 6.5 it is $1 of dimensions 2 metre into 1.5 metre and 4 Windows each of dimensions 1.5 metre and 1 metre find the cost of painting the walls at 50 rupee per metre square
Answers
Answer:
Dimensions of room = 9m × 8m × 6.5m
Area of 4 walls = 2(l + b)h
= 2 (9 + 8) × 6.5
= 13 × 17
= 221 m²
Dimensions of one door = 2m × 1.5m
Area of door = l × b
= 2 × 1.5
= 3.0 m²
Dimensions of windows = 1.5m × 1m
Area of 2 windows = 2 (l × b)
= 2 (1.5 × 1)
= 3.0 m²
Hence,
Area required for white-washing = Area of 4 walls – (area of door + area of 2 windows)
Area required for white-washing = 221 – (3 + 3)
= 221 – 6
= 215 m²
∵ cost of white-washing 1 m² = Rs. 6.40
∴ cost of white-washing 215 m² = 6.40 × 215
= Rs. 1376.