N and R is equivalent to 14th & 18 th letter in English alphabet respectively
T is 20th letter, Y is 25 th letter,
N * R/ 2 = ( 14 *18) /2 = 126;
T * Y /5=( 20* 25)/ 5 =100;
Y * P/ 8 = ( 25 *16)/ 8= 50;
K * L /11=( 11* 12)/ 11= 12;
we get 14 from this sequence, we divide by these 2 ---5--- 8--- 11--- 14 ( each one increase by 3 )
G * ?/ 14 =13
that means ( 7 * ?)/ 14 =13 --> 13*14/7 = 26
Z is 26th letter .