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A is twice as good as workman as B and therefore able to finish a piece of work in 30 days less than B. In how many days can they complete the whole work together? |
A) 20 days
B) 40 days
C) 60 days
D) 80 days
Correct Answer : 20 days Explanation : Let A takes X days to complete the work and B takes 2X days thus ,A take 30 days to complete the work and B takes 60 days |
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Prashant2018-07-28 13:52:16
Ratio of time taken=1:2 |
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16 workers working 6 hours day can build a wall of length 150m, breadth 20m, and height 12m in 25 days. In how many days 12 workers, working 8 hours a day will build a wall of length 800m, breadth 15m and height 6m? |
A) 50 days
B) 25 days
C) 25 days
D) 60 days
Correct Answer : 50 days Explanation : to build a wall of 150*20*12=36000 ,hours required = 16*6*25=2400 |
A can do a piece of work in 10 days while B can do the same work in 20 days. They start together but A leaves after three days. How many days will B take to complete the remaining work? |
A) 14 days
B) 8 days
C) 12 days
D) 11 days
Correct Answer : 11 days Explanation : One day's work of A and B = (1/10 + 1/20) = 3/20 Work done by A and B together in the 3 days = 3 (1/10 + 1/20) = 9/20 1/20 Work done by B in a day |
If 3 men or 4 women can reap a field in 30 days, how long will 3 men and 6 women take to reap it? |
A) 21 days
B) 16 days
C) 18 days
D) 12 days
Correct Answer : 12 days Explanation : 3 men can complete work in 30 days Thus, 3 men and 6 women will work in a day => 3/(3*30) + 6/(4*30) 3 men and 6 women do 1/12th part of work in a day,so they will complete the work in 12 days |
A is twice as good a workman as B, and finishes the work in 14 days less than B. In how many days can it be done by A alone? |
A) 14
B) 21
C) 28
D) 42
Correct Answer : 14 Explanation : let A take X days to complete the work and B takes 2X days thus ,A take 14 days to complete the work and B takes 28 days. |
30 persons can do a piece of work in 24 days. How many more people are required to complete the work in 20 days? |
A) 4
B) 5
C) 6
D) 10
Correct Answer : 6 Explanation : let X persons required to complete the work in 20 days thus ,num of persons, X = 720 / 20 => 36 extra ,more people required = 36 - 30 = 6 persons |
A is twice as good workman as B. Together, they finish the work in 14 days. In how many days can it be finish by B separately? |
A) 21
B) 48
C) 42
D) 35
Correct Answer : 42 Explanation : let A take X days to complete the work and B takes 2X days. Thus, |
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A can do a piece of work in 30 days while B can do it in 40 days. In how many days can A and B working together do it ? |
A) 70 days
B) 171/4 days
C) 190/7 days
D) 120/7 days
Correct Answer : 120/7 days Explanation : If X can do a piece of work in n days, then X's 1 day's work =1/n |
A can do a piece of work in 20 days which B can do in 12 days. B worked at it for 9 days. A can finish the remaining work in ? |
A) 3 days
B) 5 days
C) 7 days
D) 11 days
Correct Answer : 5 days Explanation : If X can do a piece of work in n days, then X's 1 day's work =1/n |
A and B together can do a work in 8 days. If A alone can do it in 12 days, then in how many days can B alone do it? |
A) 12 days
B) 20 days
C) 24 days
D) 28 days
Correct Answer : 24 days Explanation : If X can do a piece of work in n days, then X's 1 day's work =1/n Then ,B alone can complete = (12 * 8) / (12 - 8) = 96/4 = 24 days |
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A can do a piece of work in 12 days. B is 60% more efficient than A. The number of days, it take B to do the same piece of work is ? |
A) 15/2
B) 25/4
C) 8
D) 6
Correct Answer : 15/2 Explanation : A's 1 day's work = 1/12 |
X is 4 times more efficient than Y, in what proportion will the number of days taken by X and Y to complete any work? |
A) 8 : 1
B) 1 : 5
C) 6 : 8
D) 5 : 1
Correct Answer : 1 : 5 Explanation : If A is twice as good a workman as B, then: Efficiency (X : Y) = 5 : 1 |
20 persons completed 1/3 rd of the work in 12 days. How many more person are required to finish the rest work in next 12 days? |
A) 20
B) 12
C) 18
D) 40
Correct Answer : 20 Explanation : Work done by 20 persons = 1/3 |
6 children and 2 men complete a certain piece of work in six days. Each child takes twice the time taken by a man to finish the work. In how many days will 5 men finish the same work? |
A) 6
B) 8
C) 9
D) 15
Correct Answer : 6 Explanation : 6C + 2M = 6 days |
If 6 men and 8 boys can do a piece of work in 10 days while 26 men and 48 boys can do the same work in 2 days,then the time taken by 15 men and 20 boys in doing the same type of work will be? |
A) 4
B) 6
C) 8
D) 9
Correct Answer : 4 Explanation : Let a man one day work is X and a boy one day work is Y. Then x =1/100 15x + 20y = 15/100+20/200 = 1/4 |
6 men or 10 women can reap a field in 15 days, then the number of days that 12 men and 5 women will take to reap the same field is : |
A) 5
B) 6
C) 8
D) 12
Correct Answer : 6 Explanation : Work done by 6 men = work done by 10 women. ∴ 12 men + 5 women = 12 x ( 5 / 3) + 5 = 25 women |
A can do a work in 15 days and B in 20 days. If they work on it together for 4 days, then the fraction of the work that is left is? |
A) 1/4
B) 4/10
C) 7/15
D) 8/15
Correct Answer : 8/15 Explanation : A's 1 day's work = 1/15 |