Mother is $5$ times daughter's age. Sum $= 36$. Daughter's age is

Mother is $5$ times daughter's age. Sum $= 36$. Daughter's age is
  1. $6$
  2. $5$
  3. $30$
  4. $8$

Solution

$6x = 36 \Rightarrow x = 6$.

Asked in: IMO

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