A. 9 (1/5) days
B. 9 (2/5) days
C. 9 (3/5) days
D. 10
(A + B + C)'s 1 day's work = 1/4
A's 1 day's work = 1/16
B's 1 day's work = 1/12
=> C's 1 day's work = 1/4 - ( (1/16) + (1/12) ) = 5/48
So, C alone can do the work in 48/5 = 9 (3/5) days
A, B and C can do a piece of work in 20, 30 and 60 days respectively. In how many days can A do the work if he is assisted by B and C on every third day?
A is thrice as good as workman as B and therefore is able to finish a job in 60 days less than B. Working together, they can do it in:
A alone can do a piece of work in 6 days and B alone in 8 days. A and B undertook to do it for Rs. 3200. With the help of C, they completed the work in 3 days. How much is to be paid to C?