In a certain code language, 'CHILD' is written as 'YTSPX' and 'ADULT' is written as 'AXGPH'. How will 'YOUNG' be written in that language?

Let's look at the positional values for 'CHILD' → 'YTSPX':
C(3), H(8), I(9), L(12), D(4)
Y(25), T(20), S(19), P(16), X(24)

Let's look at the reverse pairs (opposite letters):

C → X, H → S, I → R, L → O, D → W
Now compare these opposite letters to the code 'YTSPX':

X + 1 = Y

S + 1 = T

R + 1 = S

O + 1 = P

W + 1 = X

So the logic is: Opposite letter + 1.

Let's check 'ADULT' → 'AXGPH':

Opposite of A is Z → Z + 1 = A

Opposite of D is W → W + 1 = X

Opposite of U is F → F + 1 = G

Opposite of L is O → O + 1 = P

Opposite of T is G → G + 1 = H
The logic is perfectly verified.

Now apply it to 'YOUNG':

Opposite of Y is B → B + 1 = C

Opposite of O is L → L + 1 = M

Opposite of U is F → F + 1 = G

Opposite of N is M → M + 1 = N

Opposite of G is T → T + 1 = U

Thus, 'YOUNG' is written as CMGNU.