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Answer:
12 days
Step-by-step explanation:
Time taken by A and B to plough the field together = 4 days
Time taken by B to plough the field = 6 days.
∴ A and B's 1 days' work = 14 A's 1 days' work = 16
Now, B's 1 days' work = (A and B's 1 days' work) - (B's 1 days' work) =
1/4 −1/6 = 3−2/12 = 112
Hence, A can plough the field in 12 days.