X is able to do a piece of work in 8 days and Y can do the same work in 12 days. If they can work together for 3 days, what is the fraction of work left?
Choose the correct choice from the following answers
A) 8/5
B) 6/5
C) 7/5
D) 3/5
E) 4/5
Explanation :   Amount of work X can do in 1 day = 1/8   Amount of work Y can do in 1 day = 1/12   Amount of work X and Y can do in 1 day = 1/8+ 1/12= 5/24   Amount of work X and Y can together do in 3 days = 3 × (5/24) = 5/8   Fraction of work left = 1 – 5/8= 3/5   Answer : Option 3/5
<result>D</result>
X is able to do a piece of work in 8 days and Y can do the same work in 12 days. If they can work together for 3 days, what is the fraction of work left?