$15$ men can do a piece of work in $20$ days. In how many days will $25$ men complete the same work (working…

$15$ men can do a piece of work in $20$ days. In how many days will $25$ men complete the same work (working at the same rate)?
  1. $10$
  2. $12$
  3. $14$
  4. $18$

Solution

Inverse: $15 \times 20 = 25 \times d \Rightarrow d = \dfrac{300}{25} = 12$ days.

Asked in: IMO

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