Correct option is B
Given
Radius (r) = 1 m
Length (h) = m
Total rolls = 600
10% of ground was rolled twice
Formula Used
Curved Surface Area of cylinder = 2 × π × r × h
Solution
Area covered in one roll = sq.m
Total area rolled in 600 rolls = 600 × 6 = 3600 sq.m
Let the actual area of the ground be A.
Area rolled once = 90% of A = 0.9A
Area rolled twice = 10% of A = 0.1A
Total effective area rolled = (0.9A × 1) + (0.1A × 2) = 1.1A
1.1A = 3600
A = sq.m
Final Answer
So the correct answer is (b)
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