To find a fraction equivalent to \( \frac{15}{20} \), you can simplify it by dividing both the numerator and the denominator by their greatest common divisor (GCD).
The GCD of 15 and 20 is 5.
Now, divide both the numerator and the denominator by 5:
\[ \frac{15 \div 5}{20 \div 5} = \frac{3}{4} \]
So, an equivalent fraction to \( \frac{15}{20} \) is \( \frac{3}{4} \).