P can do the work in 10 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 choice from the following answers:	A) 1/5	B) 1/4	C) 1/3	D) 2/5	E) 2/3
4/10 + 4/15 = 20/30 = 2/3 (completed work)   The work that is left is 1 - 2/3 = 1/3   The answer is 1/3.
<result>C</result>
P can do the work in 10 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?