In a certain code CHAIR is written as EGCHT. How is AUDIT written in that code?

Key idea: letters in positions 1, 3, and 5 are shifted forward by 2, and letters in positions 2 and 4 are shifted backward by 1.

1. Apply to the 1st letter: A -> C (A + 2 = C).

2. Apply to the 2nd letter: U -> T (U - 1 = T).

3. Apply to the 3rd letter: D -> F (D + 2 = F).

4. Apply to the 4th letter: I -> H (I - 1 = H).

5. Apply to the 5th letter: T -> V (T + 2 = V).

Therefore, AUDIT is encoded as CTFHV.