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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+24Y = 24 x 70 ----(1)

For the 2nd condition, we have,

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

X = 1600 and

Y =\frac{ 10}{3}

Third Condition,

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

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

1600 + 96 x (\frac{10}{3}) = 96 N

⇒N = (\frac{1920}{96})

N = 20.