80:15

The expression \( 80:15 \) represents a ratio. To simplify this ratio, you can divide both sides by their greatest common divisor (GCD).

The GCD of 80 and 15 is 5.

Now, divide both numbers by 5:

\[ \frac{80}{5} : \frac{15}{5} = 16 : 3 \]

Thus, the simplified ratio is \( 16:3 \).