Father and son

When I was eight years old, my father was 30 years old. Today, my father is 3 times more than me. How old am I?

Correct answer:

s =  11

Step-by-step explanation:

$$\begin{gathered} o=3\cdot s \\ o-s=30-8 \\ o-3s=0 \\ o-s=22 \\ o=33 \\ s=11 \end{gathered}$$

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