Answer:
4
Step-by-step explanation:
1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,21,22,23,24,25,26,27,28,29,30,31,32,33,34,35,36,37,38,39,40
5
when 13 is subtracted from 5 we get 8
again when 8=2m
8/2=m
4=m
.