Question

Fifteen years from now, Ravi’s age will be four times his present age. What is Ravi’s present age?

Answer 1

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,
$$\begin{gathered} \Rightarrow \left(x+15\right)=4x, \\ \Rightarrow 4x-x=15, \\ \Rightarrow 3x=15, \\ \Rightarrow x=5 \end{gathered}$$
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.