6.

A, B and C completed a piece of work costing Rs.1800. A worked for 6 days, B for 4 days and C for 9 days. If their daily wages are in the ratio 5 : 6 : 4, how much amount will be received by A?

 A. Rs.800 B. Rs.600 C. Rs.900 D. Rs.750
Answer:B
Explanation:

7.

A and B can finish a piece of work in 30 days. They worked at it for 20 days and then B left. The remaining work was done by A alone in 20 more days. A alone can finish the work in

 A. 48 days B. 50 days C. 54 days D. 60 days
Answer:D
Explanation:

8.

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. 1/5 B. 1/15 C. 6/15 D. 8/15
Answer:D
Explanation: A's 1 day's work = 1/15; B's 1 day's work = 1/20; (A + B)'s 1 day's work = (1/15 + 1/20) = 7/60. (A + B)'s 4 day's work = 7/60x4 =7/15. Therefore, Remaining work = (1-7/15) = 8/15.

9.

A man, a woman and a boy can together complete a piece of work in 3 days. If a man alone can do it in 6 days and a boy alone in 18 days, how long will a woman take to complete the work?

 A. 9 days B. 21 days C. 24 days D. 27 days
Answer:A
Explanation:

10.

A does half as much work as B in three- fourth of the time. If together they take 18 days to complete the work, how much time shall B take to do it?

 A. 30 days B. 35 days C. 40 days D. 42 days
Answer:A
Explanation: Let be the number of days taken by B alone to finish the whole work Then, A alone will finish the whole work in 3x/4 * 2 days = 3x/2 days. Then, working together, 3x/2 * x/3x/2 + x = 18 days 3x * x/5x = 18 3x/5 = 18 Therefore, the number of days taken by B = x = 18 * 5/3 = 30 days.