21.  A takes twice as much time as B or thrice as much time as C to finish a piece of work. Working together, they can finish the work in 2 days. B can do the work alone in: 
a.  4 days 
b.  6 days 
c.  8 days 
d.  12 days 
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Answer: (b).6 days

22.  A and B can complete a work in 15 days and 10 days respectively. They started doing the work together but after 2 days B had to leave and A alone completed the remaining work. The whole work was completed in : 
a.  8 days 
b.  10 days 
c.  12 days 
d.  15 days 
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Answer: (c).12 days

23.  A and B can do a piece of work in 30 days, while B and C can do the same work in 24 days and C and A in 20 days. They all work together for 10 days when B and C leave. How many days more will A take to finish the work? 
a.  18 days 
b.  24 days 
c.  30 days 
d.  36 days 
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Answer: (a).18 days

24.  A works twice as fast as B. If B can complete a work in 12 days independently, the number of days in which A and B can together finish the work in : 
a.  4 days 
b.  6 days 
c.  8 days 
d.  18 days 
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Answer: (a).4 days

25.  Twenty women can do a work in sixteen days. Sixteen men can complete the same work in fifteen days. What is the ratio between the capacity of a man and a woman? 
a.  3 : 4 
b.  4 : 3 
c.  5 : 3 
d.  Data inadequate 
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Answer: (b).4 : 3
