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Answer :
Let the present age of Ravi be x years.
After 15 years, his age will be = (x + 15) years
As per the conditions given, we have
\(\Rightarrow\) x + 15 = 4x
\(\Rightarrow\) 15 = 4x – x (transposing x to RHS)
\(\Rightarrow\) 15 = 3x
\(\Rightarrow\)15 ÷ 3 = x (transposing 3 to LHS)
\(\Rightarrow\) x = 5
Hence, the present age of Ravi = 5 years.