A worker completes a job in $12$ days. Days needed for $\dfrac{2}{3}$ of the job is

A worker completes a job in $12$ days. Days needed for $\dfrac{2}{3}$ of the job is
  1. $8$
  2. $6$
  3. $4$
  4. $10$

Solution

$\dfrac{2}{3} \times 12 = 8$.

Asked in: IMO

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