Question

# A swimming pool is $20m$ in length, $15m$ in breadth and $4m$ in-depth. Find the cost of painting of its four walls at the rate of $Rs20$ per square metre.

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Solution

## Step 1: Finding the area of four wallsGiven, Length $\left(l\right)=20m$Breadth $\left(b\right)=15m$Height $\left(h\right)=4m$. Area of four walls $=2\left(l+b\right)xh$ $=2\left(20+15\right)x4\phantom{\rule{0ex}{0ex}}=2x35x4\phantom{\rule{0ex}{0ex}}=280{m}^{2}$Step 2: Finding the cost of painting four walls.Since, cost of painting is at the rate of $Rs20$ per square metre.Therefore, total cost of painting its four walls $=20×280$ $=Rs560$Hence, the cost of painting its four walls at the rate of $Rs20$ per square metre is $Rs560$.

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