Question #bd0a0

1 Answer
Mar 6, 2017

$6$

Explanation:

Let's denote that number by $x$. Then we have:

$3 x = x + 12$

Now we must solve the equation:

$3 x - x = 12$

$2 x = 12$

$x = \frac{12}{2}$

$x = 6$