P is 50% more efficient than Q. P can complete a work in 25 days. If P and Q work together, how many days will it take to complete the same work?  Choose the correct option
A) 11	B) 13	C) 15	D) 17	E) 19
The work done by P in 1 day = 1/25   Let work done by Q in 1 day = q   q × (150/100) = 1/25   q = 100/(25×150) = 10/(25×15)   The work done by P and Q in 1 day = 1/25 + 10/(25×15) = 25/(25×15)= 1/15   P and Q together can do the work in 15 days.   The answer is 15.
<result>C</result>
P is 50% more efficient than Q. P can complete a work in 25 days. If P and Q work together, how many days will it take to complete the same work?