1) A can do a work in 15 days and B in 20 days. If they work on it together
for 4 days, then the fraction of the work that is left is :

A)1/4

B)1/10

C)7/15

D)8/15

Answer:
D

2) A can lay railway track between two given stations in 16 days and B can
do the same job in 12 days. With help of C, they did the job in 4 days
only. Then, C alone can do the job in:

A)9(1/5)days

B)9(2/5)days

C)9(3/5)days

D)10

Answer:
C

3) 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)12 days

B)15 days

C)16 days

D)18 days

Answer:
B

4) 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)20 days

B)22(1/2)days

C)25 days

D)30 days

Answer:
B

5) 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?