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Hint: Assume Ravi’s age is some variable and then form a linear equation to determine his age by solving it.

Let Ravi’s present age is $x$ years old.

Then after fifteen years, his age will be $\left( {x + 15} \right)$ years old.

According to the question, after fifteen years, Ravi’s age will be four times his present age. Then we have:

Age after $15$ years $ = 4 \times $Present Age,

$

\Rightarrow \left( {x + 15} \right) = 4x, \\

\Rightarrow 4x - x = 15, \\

\Rightarrow 3x = 15, \\

\Rightarrow x = 5 \\

$

Therefore, Ravi’s present age is $5$ years old.

Note: Convert the given problem statement in the form of a linear equation in one variable and then simplify to determine the required value.

Let Ravi’s present age is $x$ years old.

Then after fifteen years, his age will be $\left( {x + 15} \right)$ years old.

According to the question, after fifteen years, Ravi’s age will be four times his present age. Then we have:

Age after $15$ years $ = 4 \times $Present Age,

$

\Rightarrow \left( {x + 15} \right) = 4x, \\

\Rightarrow 4x - x = 15, \\

\Rightarrow 3x = 15, \\

\Rightarrow x = 5 \\

$

Therefore, Ravi’s present age is $5$ years old.

Note: Convert the given problem statement in the form of a linear equation in one variable and then simplify to determine the required value.