8 children and 10 men complete a certain piece of work in 9 days.Each child takes twice the time taken by a man to finish the work.In how many days will 12 men finish the same work?

(A)8

(b)9

(c)12

(d)15

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- August 28th 2008, 05:11 AMdeviNo. of days.
8 children and 10 men complete a certain piece of work in 9 days.Each child takes twice the time taken by a man to finish the work.In how many days will 12 men finish the same work?

(A)8

(b)9

(c)12

(d)15 - August 28th 2008, 05:15 AMMoo
Hello !

Usually, you can find in how many days a child finishes the work, etc...

Here's how I'd do. Since each child takes twice the time than a man, we can consider that 2 children are worth 1 man.

Hence 8 children worth 4 men. And thus 14 men would complete the piece of work in 9 days.

14 men -> 9 days

12 men -> ? days

That's a cross product:)