GCSE Maths Practice: inverse-proportion

\( \begin{array}{l} \text{y is inversely proportional to x.} \\ \text{When x = 4, y = 15.} \\ \text{Find y when x = 6.} \end{array} \)

Choose one option:

\( \text{6} \) \( \text{8} \) \( \text{10} \) \( \text{12.5} \)