together A and B plough a field in 4 days. B alone take 6 days to plough the same field in how many day A alone plough the field.
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Step-by-step explanation:
let A one day work =1/A
B one day work =1/6
together one day work =1/4
1/A=1/4-1/6
1/A=3-2/12=1/12
A alone plough the field in 12 days
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