Respuesta :

thechomania

Answer:

31

Step-by-step explanation:

5---11

12---25

hmmm

isn't that jsut x * 2 + 1?

soooo

15 would be

15*2+1

which is 31

itzshiane

Answer:

31.

Step-by-step explanation:

5+5 = 10 + 1 = 11

12 + 12 = 24 +1 = 25

15 + 15 = 30 + 1 = 31

I don't know I tried to see if that was the pattern. It checks out math wise.