$36$ men can build a wall in $21$ days. How many men are needed to build the same wall in $14$ days?

$36$ men can build a wall in $21$ days. How many men are needed to build the same wall in $14$ days?
  1. $48$
  2. $54$
  3. $56$
  4. $60$

Solution

$36 \times 21 = m \times 14 \Rightarrow m = \dfrac{756}{14} = 54$.

Asked in: IMO

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