Question

the cost of levelling a square lawn at rs 15 per square metre is rs 19935. find the cost of fencing the lawn at rs 22 per metre.

Answer 1

Cost of leveling the square field or lawn at Rs. 15 per square meter 
= Rs. 19935
So, the area of the square field or lawn (whatever it is) = 19935/15
Area = 1329 sq m
Length of each side = √1329
Length of each side of square field or lawn = 36.45 meter

Now,
Perimeter of square field or lawn = 4*side
⇒ 4*36.45
Perimeter of square field or lawn = 145.80 meter

Cost of fencing per meter = Rs. 22 
So, Total cost of fencing the square field or lawn = 145.80*22
Cost of fencing = Rs. 3207.6
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Answer 2

Cost of leveling the square field or lawn at Rs. 15 per square meter 
= Rs. 19935
So, the area of the square field or lawn (whatever it is) = 19935/15
Area = 1329 sq m
Length of each side = √1329
Length of each side of square field or lawn = 36.45 meter

Now,
Perimeter of square field or lawn = 4*side
⇒ 4*36.45
Perimeter of square field or lawn = 145.80 meter

Cost of fencing per meter = Rs. 22 
So, Total cost of fencing the square field or lawn = 145.80*22
Cost of fencing = Rs. 3207.6