# Kevin is 39 years old and Daniel is 3 years old How many years will i take until Kevin is only 4 times as old as Daniel?

Nov 23, 2016

$9$ years

#### Explanation:

Let $y$ be the required number of years.

Then after $y$ years
$\textcolor{w h i t e}{\text{XXX}} 39 + y = 4 \times \left(3 + y\right)$

$\textcolor{w h i t e}{\text{XXX}} 39 + y = 12 + 4 y$

$\textcolor{w h i t e}{\text{XXX}} 27 = 3 y$

$\textcolor{w h i t e}{\text{XXX}} 9 = y$