Some persons can do a piece of work in 12 days. Two times

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Some persons can do a piece of work in 12 days. Two times the number of such persons will do half of that work in :

1. 16
2. 12
3. 8
4. 3

Correct Option: D

Let M men can do the in 12 days and the required number of days be D.
More men, Less days [ Indirect Proportion ]
Less work, Less days [ Direct Proportion ]
By chain rule ,

⇒ 2M x 1 x D = M x	1	x 12
	2

⇒ D = 3 days
Thus , required answer is 3 days .