The length, breadth and height of a room are 11m, 10m, 5m respectively. Find the cost of whitewashing its four walls and the ceiling at the rate of Rs 5 per m square.

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Solution

Length, l = 11 m
breadth, b = 10 m
height, h = 5 m
area to be whitewashed = area of 4 walls + area of ceiling
= $= 2 [l + b] h + l b = 2 \times 21 \times 5 + 110 = 210 + 110 = 320 m^{2}$

Required cost = Rs. 5 $\times 320$ = Rs. 1600

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The length, breadth and height of a room are 11m, 10m, 5m respectively. Find the cost of whitewashing its four walls and the ceiling at the rate of Rs 5 per m square.

Length, l = 11 m breadth, b = 10 m ​height, h = 5 m ​area to be whitewashed = area of 4 walls + area of ceiling = = 2[l + b] h + lb = 2 × 21 × 5 + 110 = 210 + 110 = 320 m2 Required cost = Rs. 5 × 320 = Rs. 1600

Length, l = 11 m
breadth, b = 10 m
height, h = 5 m
area to be whitewashed = area of 4 walls + area of ceiling
= $= 2 [l + b] h + l b = 2 \times 21 \times 5 + 110 = 210 + 110 = 320 m^{2}$

Required cost = Rs. 5 $\times 320$ = Rs. 1600