Question

find the cost of digging a pit to form a well of diameter 3M and depth 21m at the rate of 5 per metre cube

Answer 1

cost = volume x rate
volume = πr²h=22/7 x 3/2 x 3/2 x 21
=148.5m²
cost=148.5 x 5
=742.5 Rupees

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Answer 2

The  cost of digging a pit is Rs.742.

Step-by-step explanation:

Diameter of well = 3 m

Radius of well =$\frac{3}{2} = 1.5 m$

Depth of well = 21 m

Volume of well =$\pi r^2 h = \frac{22}{7} \times 1.5^2 \times 21 = 148.5 m^3$

Cost of digging 1 cubic m = Rs.5

Cost of digging 148.5 cubic m = $148.5 \times 5 =Rs. 742.5$

Hence The  cost of digging a pit is Rs.742.5

#Learn more:

Find the cost of digging a cuboidal pit 8meter for long and 3M deep at the rate of 30 per metre cube.​

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