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The length and breadth of a wall is 10m,15m respectively. a window is fitted in the wall of side 5m . If the cost of whitewashing the wall is rupees 5625 , find the cost of whitewashing per meter.
Given:
The length and breadth of a wall is 10m,15m respectively.
A window is fitted in the wall of side 5m
The cost of whitewashing the wall is Rs 5625
To do: Find the cost of whitewashing per meter
Solution:
The wall is rectangular in shape; length L = 10m; Breadth = 15m
Area of wall = $10 \times 15$ = 150 sq m
Assuming square window of side 5 m; Area of window = $5 \times 5$ = 25 sq m
Area of wall painted = $150 - 25 = 125$ sq m
Cost of whitewashing = Rs $5625$
Therefore, rate of whitewashing = $\frac{5625}{125}= Rs 45$ per sq m
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