P can do the work in 8 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 most appropriate option.
A) 2/15	B) 2/11	C) 1/4	D) 1/5	E) 1/6
4/8 + 4/12 = 1/2 + 1/3 = 5/6 (completed work)   The work that is left is 1 - 5/6 = 1/6   The answer is 1/6.
<result>E</result>
P can do the work in 8 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?