A can do a job in 16 days, B can do same job in 12 days. With the help of C they did the job in 4 days. C alone can do the same job in how many days ?  Choose the correct choice from the following answers.
A) 6 1/2days	B) 7 1/2days	C) 8 3/5days	D) 9 3/5days	E) 10 1/2 days
Explanation:   In this question we having, A's work, B's work and A+B+C work. We need to calculate C's work.   We can do it by,   (A+B+C)'s work - (A's work + B's work).   Let's solve it now:   C's 1 day work =   1/4−(1/16+1/12)=(1/4−7/48)=5/48   So C can alone finish the job in 48/5 days,   Which is =   9 3/5days   Option 9 3/5days
<result>D</result>
A can do a job in 16 days, B can do same job in 12 days. With the help of C they did the job in 4 days. C alone can do the same job in how many days ?