P can do the work in 12 days and Q can do the same work in 15 days. If they work together for 4 days, what is the fraction of work that is left? Choose the correct answer: A) 1/5 B) 2/5 C) 7/15 D) 11/15 E) 23/30
4/12 + 4/15 = 1/3 + 4/15 = 9/15 = 3/5 (completed work)   The work that is left is 1 - 3/5 = 2/5   The answer is 2/5.
<result>B</result>
P can do the work in 12 days and Q can do the same work in 15 days. If they work together for 4 days, what is the fraction of work that is left?