# Suppose you have 30 CDs. You know that you have 11 more CDs than your friend. How do you write and solve an equation to find the number of CDs your friend has?

Nov 15, 2016

A simple equation would be: $x + 11 = 30$.

My friend, therefore, has $19$ CDs.

#### Explanation:

We consider the number of CDs my friend has as $x$.

Since we know that I have $30$ CDs which is $11$ more than what my friend has, the equation can be simply written as:

$x + 11 = 30$

Subtracting $11$ from both sides, we get:

$x = 30 - 11$

$\therefore x = 19$