21.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
View Answer with Explanation
22.
|
A can do a piece of work in 4 hours; B and
C together can do it in 3 hours, while A and C together can do it in 2 hours.
How long will B alone take to do it?
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8 hours
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10 hours
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12 hours
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24 hours
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23. Two persons A and B working together can
dig a trench in 8 hours while A alone can dig it in 12 hours. In how many hours
B alone can dig such a trench?
A.14 Hours B.24 Hours
C.8 Hours D.12 Hours
24.10 women can complete a work in 7 days and
10 children take 14 days to complete the work. How many days will 5 women and
10 children take to complete the work?
A. 1
B. 3
C.
5 D. 7
25.
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A can do a certain work in the same time in
which B and C together can do it. If A and B together could do it in 10 days
and C alone in 50 days, then B alone could do it in:
|
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15 days
|
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20 days
|
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25 days
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30 days
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26.A does a work in 10 days and B does the
same work in 15 days. In how many days they together will do the same work?
A. 5
days B. 6 days
C. 8
days D. 9 days
27. A and B can do a piece of work in 12
days; Band C can do it
in 15 days ; A and C can do it in 20 days. In
how many days will A, Band' C finish it, working all together?Also ,find the
number of days taken by each to finish it working alone.
A.30,20,60 B.20,30,60
C.60,20,30 D.20,30,60
28. 3
men can complete a piece of work in 6 days. Two days after they started the
work, 3 more men joined them. How many days will they take to complete the
remaining work?
A.6 Days B.4
Days
C.2 Days D.8
Days
29.
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A does 80% of a work in 20 days. He then
calls in B and they together finish the remaining work in 3 days. How long B
alone would take to do the whole work?
|
|
|
23 days
|
|
37 days
|
|
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37
|
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40 days
|
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30.10 men and 15 women together can complete
a work in 6 days. It takes 100 days for one man alone to complete the same
work. How many days will be required for one woman alone to complete the same
work?
A. 90 B.
145
C. 150 D.
225
