a. 8
b. 7
c. 4
d. 5
ANSWER: 5
Explanation:
(P + Q)'s 1 day's work = 1/4, P's 1 day's work = 1/20
Q's 1 day's work = (1/4 – 1/20) = (4/20) = (1/5)
Hence, Q alone can complete the work in 5 days.
P and Q together can complete a piece of work in 4 days. If P alone can complete the same work in 20 days, in how many days can Q alone complete that work?
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