A and B together can complete a piece of work in 4 days. If A alone can complete the same work in 12 days, in how many days can B alone complete that work?
Choose the correct choice from the following answers:
A) 6 days B) 7 days C) 8 days D) 9 days E) 10 days
Sol. (A + B)'s 1 day's work = (1/4). A's 1 day's work = (1/12).   B's 1 day's work =((1/4)-(1/12))=(1/6)   Hence, B alone can complete the work in 6 days.   Option 6 days
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A and B together can complete a piece of work in 4 days. If A alone can complete the same work in 12 days, in how many days can B alone complete that work?