Time And Work

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81 X can do 20% of a work in a day, Y can do 25% of the same work in a day and X, Y and Z together can do 50% of the same work in a day. How many per cent of work can be done by Z in a day?

A
5%
B
10%
C
15%
D
20%

82 5 men start working to complete a work in 15 days. After 5 days, 10 women are accompanied by them to complete the work in next 5 days. If the work is to be done by women only, when could the work be over, if 10 women have started it?

A
10 days
B
18 days
C
15 days
D
12 days

83 In a factory, there are equal number of women and children. Women work for 6 h a day and children for 4 h a day. During festival time, the work load goes up by 50%. The government rule does not allow children to work for more than 6 h a day. If they are equally efficient and the extra work is done by women, then extra hours of work put in by women everyday are

A
5
B
3
C
4
D
9

84 A can do a piece of work in 10 days while B can do it in 15 days. They begin together but 5 days before the completion of the work, B leaves off. Find the total number of days for the work to be completed:

A
4 days
B
6 days
C
7 days
D
8 days

85 A can do a piece of work in 14 days which B can do in 21 days. They begin together but 3 days before the completion of the work, A leaves off. The total number of days to complete the work is:

A
6 3/5 days
B
12 $$\frac{1}{2}$$ days
C
10 1/5 days
D
13 days

86 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
12 days

87 16 children and 24 men complete a certain work in 18 days. If each child takes twice the time taken by a man to finish the work, in how many days will 24 men finish the same work?

A
12 days
B
24 days
C
36 days
D
48 days

88 A contractor undertook to finish a certain work in 124 days and employed 120 men. After 64 days, he found that he had already done $$\frac{2}{3}$$ of the work. How many men can be discharged now, so that the work may finish in time ?

A
40
B
50
C
48
D
56

89 A, B and C can do a piece of work in 16, 32 and 48 days, respectively. They all begin together. A work continuously till it is finished, C leaves the work 2 days before it's completion and B leaves the work 1 day before it's completion. In what time is the work finished?

A
10 1/11 days
B
9 4/11 days
C
15 days
D
30 days

90 A is thrice as good a workman as B and therefore is able to finish a job in 30 days less than B. How many days will they take to finish the job working together?

A
11 1/4 days
B
12 1/4 days
C
13 1/4 days
D
14 1/4 days