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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

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