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Question 1:
A and B can together 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 ?
A. 4 days
B. 5 days
C. 6 days
Feedback (A+B)'s 1 day work = 1/4
A's 1 day work = 1/12
B's 1 day work = 1/4−1/12)= 3−1/12=1/6
So B alone can complete the work in 6 days
D. 7 days

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