Father is $32$, son is $4$. After how many years will father be thrice the son?

Father is $32$, son is $4$. After how many years will father be thrice the son?
  1. $10$
  2. $5$
  3. $8$
  4. $12$

Solution

$32 + t = 3(4 + t) \Rightarrow 32 + t = 12 + 3t \Rightarrow t = 10$.

Asked in: IMO

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