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
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
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
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