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 
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Answer: (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(1/5)days 
b.  9(2/5)days 
c.  9(3/5)days 
d.  10 
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Answer: (c).9(3/5)days

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 
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Answer: (b).15 days

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 
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Answer: (b).22(1/2)days

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.  Rs. 400 
c.  Rs. 600 
d.  Rs. 800 
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Answer: (b).Rs. 400
