P alone can complete a piece of work in 12 days. Work done by Q alone in one day is equal to one-third of the work done by P alone in one day. In how many days can the work be completed if P and Q work together?
Choose the correct answer:
A) 6 (1/4) days	B) 9 days	C) 7 (3/4) days	D) 8 days	E) 9 (3/4) days
Work done by P alone in one day = 1/12th of the total work done by Q alone in one day = 1/3(of that done by P in one day) = 1/3(1/12 of the total) = 1/36 of the total.   Work done by P and Q, working together in one day = 1/12 + 1/36 = 4/36=1/9 of the total   They would take 9 days to complete the work working together.   ANSWER:9 days
<result>B</result>
P alone can complete a piece of work in 12 days. Work done by Q alone in one day is equal to one-third of the work done by P alone in one day. In how many days can the work be completed if P and Q work together?