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The correct option is b.

Sol:

Let initially X sugar canes were present there, and it is increasing by Y sugar cane per day, then for the first condition We get,

X+24*y = 24*70 ----(1)

For the 2nd condition, we have,

X+60*Y = 60*30----(2) Now, On solving equation (1) and (2), we get

X = 1600 and

Y = 10 /3

Third Condition,

X+96*Y = 96 *N -----(3) [**N = Number of workers required**]

Putting the values of X and Y in equation (3), We get

1600 + 96 * (10/3) = 96 * N

⇒N = (1920/96)

N = 20.