If WATER is coded as 30 and ORANGE is coded as 36, what will EIGHT be coded as?

Let's count the number of letters in each word and look for a mathematical relation to the code value:
WATER: Contains 5 letters (W, A, T, E, R).

Code=5×6=30
ORANGE: Contains 6 letters (O, R, A, N, G, E).

Code=6×6=36
The logic is: Number of letters in the word×6=Code value.

EIGHT: Contains 5 letters (E, I, G, H, T).

Code=5×6=30
Hence, EIGHT will be coded as 30.