It will be 106 because the number increase by increments of 5 10 15 20 25 30
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31. 5 = 1+4 10 = 5+5 16 = 10+6 23 = 16+7 31 = 23+8 Next number will be 31+9 = 40. After that, 40+10 = 50.
The next number is 49+8 = 57
16 to 26 (+10) 26 to 21 (-5) 21 to 31 (+10) 31 (-5) = 26 26
The rule is 5, 10, 15 and so the next number will be 20+31 = 51