Length breadth & height of the room are 5m 4m and 3m. Find cost of whitewashing the walls of room & ceiling @ rs 7.50 per m square
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Given length, breadth and height of the room are 5m , 4m and 3m .
let length l = 5m , beadth b = 4m height h =3m
Find the area of walls :
-------------------------------
area of the walls = 2 ( bh + hl )
= 2(4 × 3 + 3 × 5 ) = 2 ( 12 + 15 ) = 54m^2
Find the area of celiing :
--------------------------------
area of celiing = l × b = 5 × 4 = 20 m^2
total area to be whitewashed
= area of walls + area of celiing
= 54 + 20 = 74 m^2
cost of whitewashing 1m^2 = ₹7.50
cost of whitewashing 74 m^2
= 74 × 7.50 = ₹555
therefore,the cost of whitewashing the walls and the ceiling of the room= ₹555
Answer : cost = ₹555
_______________________________
let length l = 5m , beadth b = 4m height h =3m
Find the area of walls :
-------------------------------
area of the walls = 2 ( bh + hl )
= 2(4 × 3 + 3 × 5 ) = 2 ( 12 + 15 ) = 54m^2
Find the area of celiing :
--------------------------------
area of celiing = l × b = 5 × 4 = 20 m^2
total area to be whitewashed
= area of walls + area of celiing
= 54 + 20 = 74 m^2
cost of whitewashing 1m^2 = ₹7.50
cost of whitewashing 74 m^2
= 74 × 7.50 = ₹555
therefore,the cost of whitewashing the walls and the ceiling of the room= ₹555
Answer : cost = ₹555
_______________________________
Answered by
4
Find the area of the ceiling:
Area = Length x Breadth
Area = 5 x 4 = 20 m²
Find the area of the 4 walls:
Area = Perimeter x Height
Area = 2( 5 + 4) x 3 = 18 x 3 = 54 m²
Find the total area:
Total area = 20 + 54 = 74 m²
Find the cost of whitewashing:
1 m² = Rs 7.50
74 m² = 7.5 x 74 = Rs 555
Answer: It will cost Rs 555
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