In a certain code, DOOR is written as WLLI. How is CUP written in that code?

💡 Solution & Explanation

Each letter is replaced by its opposite letter in the alphabet (A ↔ Z, B ↔ Y, C ↔ X, and so on). A letter and its opposite always add up to 27 in position: D (4) → W (23), O (15) → L (12), O (15) → L (12), R (18) → I (9). For CUP: C → X, U → F, P → K. So the code is XFK.