P and Q together can do a work in 6 days. If P alone can do it in 15 days. In how many days can Q alone do it? Choose the most appropriate option.
A) 5
B) 4
C) 10
D) 11
E) 12
1/6-1/15 ==&gt;1/10   ==&gt;10   ANSWER 10
<result>C</result>
P and Q together can do a work in 6 days. If P alone can do it in 15 days. In how many days can Q alone do it?