The dimensions of room are(9m×8m×6.5m). It has one door of dimensions (2m×1.5m) and two windows , each of dimensions (1.5m×1m). Find the cost of whitewashing the walls at Rs.6.40 per square metre
Answers
if not to colour the floor and top then
lateral surface area of room =2h(b+l)
h=6.5,l=9,b=8
therefore,2×6.5(9+8)
13×17
221m^2
and leaving door and window then
area of door=2×1.5=3
and two windows=2×1.5×1=3
therefore, total=221-3-3=215
cost=215×6.40
=1376RS
HOPE IT HELPS......
Dimensions of a room are (9m×8m×6.5m).
Area of the room = 2(l+b)×h
= 2(9+8)×6.5 m²
= 2×17×6.5 m²
= 221m²
Area of door = (2m×1.5m)m²
= 3m²
Area of each window = (1.5m×1m)m²
= 1.5m²
Area of two windows = (1.5×2)m²
= 3m²
Total area of door and windows
= (3+3)m²
= 6m²
Area of the four walls = (221-6)m²
= 215m²
Cost of whitewashing the walls at ₹6.40 per square metre
= ₹(215×6.40)
= ₹1,376
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