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 :
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Let x men can do the in 12 days and the required number of days be z
More men, Less days [Indirect Proportion]
Less work, Less days [Direct Proportion ]
men 2x:xwok1:2} :: 12 : z
∴(2x×1×z)=(x×12×12)
⇒z=3
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