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It was calculated that 75 men could complete a piece of work in 20 days.
When work was scheduled to commence, it was found necessary to send 25
men to another project. How much longer will it take to complete the work?

30
33
15
20
Explanation:

Before:
One day work = 1 / 20
One mans one day work = 1 / ( 20 * 75)
Now:
No. Of workers = 50
One day work = 50 * 1 / ( 20 * 75)
The total no. of days required to complete the work = (75 * 20) / 50 =
30
Additional Questions

A man was engaged on a job for 30 days on the condition that he would get a
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each day of his absence. If he gets Rs. 216 at the end, he was absent for work
for ... days

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If A can complete a work in 10 days and B is 100 faster than A.
How much time B will take to complete the work?

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A can do a piece of work in 7 days of 9 hours each and B alone can do it in 6 days
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It was calculated that 75 men could complete a piece of work in 20 days.
When work was scheduled to commence, it was found necessary to send 25
men to another project. How much longer will it take to complete the work?

Answer
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