In 2008, a pair of Yubari melons from Japan sold for $23,000 each, making them the most expensive fruit in the world. Click here for the answer and explanation.

**Solution: **

Let the price of one apple be A and the price of a mango be M.

3A + M = 63, and A + 3M = 69. Multiplying first equation by 3, we get 9A + 3M = 189. Subtracting A + 3M = 69 from 9A + 3M = 189, we get 8A = 120 => A = 15.

Plugging this back into either of the equations gives us M = 18.

The correct choice is D.