To solve the equation \( \frac{15}{2} = \frac{75}{y} \), you can cross-multiply:
\[ 15y = 2 \times 75 \]
Calculating the right side:
\[ 15y = 150 \]
Now, divide both sides by 15 to solve for \( y \):
\[ y = \frac{150}{15} = 10 \]
So, \( y = 10 \).