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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.