If a given work is done by some men in 15 days in such a way that on first day there only one man was working on second day another man joined him on the third day another joined and so on. Then in how many days 4 men will finish the work?a)32b)30c)28d)24Correct answer is option 'B'. Can you explain this answer?

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If a given work is done by some men in 15 days in such a way that on first day there only one man was working on second day another man joined him on the third day another joined and so on. Then in how many days 4 men will finish the work?

a)
32
b)
30
c)
28
d)
24

Correct answer is option 'B'. Can you explain this answer?

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