P is able to do a piece of work in 10 days and Q can do the same work in 12 days. If they can work together for 5 days, what is the fraction of work left? Choose the correct choice from the following:  A) 7/12  B) 5/12  C) 1/12  D) 3/12  E) 1/2
Explanation :   Amount of work P can do in 1 day = 1/10   Amount of work Q can do in 1 day = 1/12   Amount of work P and Q can do in 1 day = 1/10+ 1/12 = 11/60   Amount of work P and Q can together do in 5 days = 5 × (11/60) =11/12   Fraction of work left = 1 – 11/12= 1/12   Answer : Option 1/12
<result>C</result>
P is able to do a piece of work in 10 days and Q can do the same work in 12 days. If they can work together for 5 days, what is the fraction of work left?