In a certain code language, 'FINE' is written as 'HKLC' and 'TOUR' is written as 'VQSP'. How will 'MILK ' be written in that language?

Let's find the relational pattern between the letters of the words and their codes:
FINE → HKLC

F (6) $+2=$ H (8)

I (9) $-2=$ G (Wait, the code has K, let's check: I (9) $+2=$ K (11))

N (14) $-2=$ L (12)

E (5) $-2=$ C (3)

Pattern: +2,+2,−2,−2

Let's test this pattern on TOUR → VQSP:

T (20) $+2=$ V (22)

O (15) $+2=$ Q (17)

U (21) $-2=$ S (19)

R (18) $-2=$ P (16)

Pattern +2,+2,−2,−2 is consistent.

Now apply this pattern to MILK:

M (13) $+2=$ O (15)

I (9) $+2=$ K (11)

L (12) $-2=$ J (10)

K (11) $-2=$ I (9)

Thus, MILK is written as OKJI.