P can do the work in 10 days and Q can do the same work in 12 days. If they work together for 4 days, what is the fraction of work that is left?  Choose the correct answer:
A) 1/3	B) 1/5	C) 2/5	D) 4/15	E) 7/15
4/10 + 4/12 = 44/60 = 11/15 (completed work)   The work that is left is 1 - 11/15 = 4/15   The answer is 4/15.
<result>D</result>
P can do the work in 10 days and Q can do the same work in 12 days. If they work together for 4 days, what is the fraction of work that is left?