3. Eric has rock and classical MP3s on his computer. The number of rock MP3s is 3 times more than the number of classical MP3s. Write an expression for the number of rock MP3s.

Answer 1

Let's call the number of classical MP3s "c."

In math terms, we say...

Let c = the number of classical MP3s.

Let's say Eric has 12 classical MP3s. How many rock MP3s does he have? 3(12), right?

So, if Eric has c classical MP3s, he has 3(c) rock MP3s, or, as we say...

3c