Question

A grassy park of length 20 m and breadth 15 m is there. There is a circular pond of radius 7 m at the centre of it. Find the cost of cementing the park except the pond, at the rate of Rs. 15 per sq. m. Assume that there is no place left except pond. Give the correct answer. ...no spam​

Answer 1

Answer:

The answer might be 2192 rupees.

( I just tried and I am not sure whether the answer is right or not )

Answer 2

Length of the park = 20 m

Breadth of the park = 15 m

Radius of the pond = 7 m

In this case,

Area to be cemented = Area of the park - Area of the pond

Area of the park:- (rectangular)

Area of rectangle = lb

∴ Area = 20 m × 15 m = 300 m²

Area of the pond:- (circular)

Area of circle = πr²

∴ Area = (22/7)(7 m)(7 m) = (22)(7) m² = 154 m²

∴ Area to be cemented = 300 m² - 154 m² = 146 m². And cost = (146 m²)(15/m²) = 146 × 15 = 2190 rupees.

@Psyclone