If 1+5=24, 2+6=20, 3+7=14 and 4+8=5 then 5+9=??

Question

IF
1,3,3=5
9,7,4=8
11,14,10=15
20,16,12=18
Than
3,6,7=?

Answer 1

14
Alphabetical order of the last letter of summation
fourteen--> n is the fourteenth letter