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Q.
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
A.
6 days
B.
12 days
C.
4 days
D.
3 days
View Answer
Correct choice: D
Explanation:
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:x} work 1:1/2} :: 12 : z ∴(2x×1×z)=(x×1/2×12) ⇒z=3
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