SSC CHSL 8 Jan 2017 Shift 1 Paper

The pattern followed is that the alphabets are numbered alphabetically, A=1, B=2, C=3 and so on and then the first number in each column is obtained by :
D=4 and W=23, ⇒ 23 - 4 = 19
E=5 and J=10, ⇒ 10 - 5 = 5
Similarly, P=16 and Z=26, ⇒ 26 -16 = 10