26.  A and B can do a work in 8 days, B and C can do the same work in 12 days. A, B and C together can finish it in 6 days. A and C together will do it in : 
a.  4 days 
b.  6 days 
c.  8 days 
d.  12 days 
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Answer: (c).8 days

27.  A can finish a work in 24 days, B in 9 days and C in 12 days. B and C start the work but are forced to leave after 3 days. The remaining work was done by A in: 
a.  5 days 
b.  6 days 
c.  10 days 
d.  10(1/2) days 
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Answer: (c).10 days

28.  X can do a piece of work in 40 days. He works at it for 8 days and then Y finished it in 16 days. How long will they together take to complete the work? 
a.  13(1/3)days 
b.  15 days 
c.  20 days 
d.  26 days 
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Answer: (a).13(1/3)days

29.  A and B can do a job together in 7 days. A is 1(3/4) times as efficient as B. The same job can be done by A alone in : 
a.  9(1/3) days 
b.  11 days 
c.  12(1/4) days 
d.  16(1/3) days 
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Answer: (b).11 days

30.  A and B together can do a piece of work in 30 days. A having worked for 16 days, B finishes the remaining work alone in 44 days. In how many days shall B finish the whole work alone? 
a.  30 days 
b.  40 days 
c.  60 days 
d.  70 days 
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Answer: (c).60 days
