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

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 days 5

B.
 9 2 दिन 5
C.
 9 3 दिन 5
D. 10

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 दिन C. 16 दिन D. 18 दिन

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 दिन 2
C. 25 दिन
D. तीस दिन

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?

 A. Rs. 375 B. 400 रुपये C. 600 रुपये D. 800 रुपये