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90 men are engaged to do a piece of work in 40 days but it is found that in 25 days, 23 work is completed. How many men should be allowed to go off so that the work may be finished in time?

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Important Questions on Time and Work

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36 work men are employed to finish a certain work in 48 days. But it is found that in 24 days only 25 work is done. How many more men must be taken to finish the work in time?
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Two men A and B, started a job in which A was thrice as good as B and therefore took 60 days less than B to finish the job. How many days will they take to finish the job, if they start working together?
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A group of labourers promise to do a work in 12 days, but 5 of them do not turn up. If rest of the group do the work in 18 days, find the original number of men?
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20 women can do a job in 20 days. After each day, a woman is replaced by a man and a man is twice as efficient as a woman. On which day does the job get completed?
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If m men working m hour per day, can do m units of work in m days, then n men working n hour per day would be able to complete how many units of work in n days?
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There is sufficient food for 800 men for 62 days. After 56 days, 560 men leave the place. For how many days will the rest of food last for the rest of the men?
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Two pipes A and B can fill a tank in 20 min and 30 min, respectively. If both pipes are opened together, the time taken to fill the tank is_____.

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A tap can fill a tank in one hour. A second tap can empty it in 30 min. If both the taps operate simultaneously, how much time is needed to empty the tank?