Patrick D. answered • 04/26/17

Patrick the Math Doctor

1

6 half of 16 is 8, so half of 12 is 6

60 4+5=9, 5+9=14, 9+14=23, 14+23=37, 23+37 = 60

38 9-3=6 , 21-9 = 12 (the difference doubles)

21-17 = 4, 25 - 17 = 8 (the difference doubles)

25-12 = 13, so the next difference must be 26.