A can complete a work in 6 days. A and B together can complete the same work in 4 days. In how many days B can complete the work alone.
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Answer:
a=6
a+b=4
1/6+1/4
3/12
a+b=3work in a day
a=12/6=2work in a day
a-b=1
12/1
b can complete a work in 12days
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