In a certain code language, 'CHILD' is written as ‘6169248' and 'GUES…

1   2    3    4   5    6   7     8    9  10  11  12  13

 A   B   C    D   E    F   G    H    I    J    K    L   M

 ↓    ↓    ↓    ↓    ↓     ↓   ↓    ↓     ↓   ↓    ↓    ↓    ↓

 Z   Y    X   W   V    U   T    S    R   Q   P    O   N

26  25  24  23  22  21  20  19  18  17  16  15  14

**********************************************************

THE LOGIC FOLLOWED HERE IS :

CONSONANTS VALUE IS MULTIPLIED BY 2 AND VOWELS ARE SAME

C  → PLACE VALUE → 11 → (×2 )→ 22

H  → PLACE VALUE → 8 → (×2 )→ 16

I  → PLACE VALUE → 9 → (NON CHANGE )→  9

L  → PLACE VALUE → 12 → (×2 )→ 24

D  → PLACE VALUE → 4 → (×2 )→ 8

CHILD = 22169248

AND

G  → PLACE VALUE → 7 → (×2 ) → 14

U  → PLACE VALUE → 21 → (NON CHANGE) → 21

E  → PLACE VALUE → 5 → (NON CHANGE)  →  5

S  → PLACE VALUE → 19 → (×2 )→ 38

T  → PLACE VALUE → 20 → (×2 )→ 40

GUEST = 142153840

SIMILARLY

B  → PLACE VALUE → 2 → (×2 ) → 4

O  → PLACE VALUE → 15 → (NON CHANGE) → 15

O  → PLACE VALUE → 15  → (NON CHANGE)  →  15

K  → PLACE VALUE → 11 → (×2 )→ 22

BOOK = 4151522