CSEC Additional Mathematics · 2018 · Paper 1 · Question Q9

If f : x \to 2\left(\frac{x}{3} + 5\right), then f^{-1}(x) is equal to

1. (A)3\left(\frac{x}{2} - 5\right)
2. (B)3\left(\frac{x}{2} + 5\right)
3. (C)\frac{1}{3}\left(\frac{x}{2} - 5\right)
4. (D)\frac{3(x - 2)}{5}