11.

9 children can complete a piece of work in 360 days; 18 men can complete the same piece of work in 72 days and 12 women can complete it in 162 days. In how many days can 4 men, 12 women and 10 children together complete the piece of work?

 A. 68 days B. 81 days C. 96 days D. 124 days
Explanation:

12.

Two pipes can fill a tank in 20 and 24 minutes respectively and a waste pipe can empty 3 gallons per minute. All the three pipes working together can fill the tank in 15 minutes. The capacity of the tank in gallons is.

 A. 100 B. 115 C. 120 D. 125
Explanation: Work done by the waste pipe in 1 minute 1/15 - (1/20 + 1/24) 1/15 - 11/120 = -1/40 Volume of 1/14 part = 3 gallons. Therefore, Volume of whole =(3*40)gallons = 120 gallons.

13.

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. 400 B. 550 C. 600 D. 725
Explanation: C's 1 day's work = 1/3 - (1/6 + 1/8) = 1/3- 7/24 = 1/24. A's wages : B's wages : C's wages = 1/6 : 1/8 : 1/24 = 4 : 3 : 1 C's share (for 3 days) = Rs. (3 x 1/24 x 3200) Rs. = 400.

14.

3 men or 5 women can do a work in 12 days. How long will 6 men and 5 women take to finish the work?

 A. 30 B. 26 C. 24 D. 21