Discussion
Five years ago, John’s age was half of the age he will be in 8 years. How old is he now?
Answer: B
Let John's present age be \(x\)
\(\therefore \) \(x-5=\) \(\frac{1}{2}\left ( x+8 \right )\)
\(\Rightarrow \) \(x-5=\) \(\frac{1}{2}x +4\)
\(\Rightarrow \) \(\frac{1}{2}x=9\)
\(\Rightarrow \) \(x=18\)
Hence, John's is 18 years old.
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