In a code language, 'PARENT' is written as ‘11, 26, 9, 22, 13, 7’ and ‘DUMPSTER’ is written as ‘23, 6, 14, 11, 8, 7, 22, 9’. How will ‘FLASK’ be written in that language?

21, 15, 26, 8, 16

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 pattern here is;

(opposite value of the letters are written in the codes)

 'PARENT' is written as ‘11, 26, 9, 22, 13, 7

So,

P →  11

A → 26

R → 9

E → 22

N → 13

T → 7

And,

D → 23

U → 6

M → 14

P → 11

S → 8

T → 7

E → 22

R → 9

Similarly,

F → 21

L → 15

A → 26

S → 8

K → 16

Thus, 21, 15, 26, 8, 16 is correct.