what is the next number?

Question

0, 6, 17, 33, 54

Answer 1

The series is 0 , 6 , 17 , 33 , 54

The pattern of series is diffrence between the numbers and incresing 5 for every difference number.

 Differenc between in order every two numbers in the series is 6 , 11 , 16 , 21

6 + 5 = 11

11 + 5 = 16

16 + 5 = 21

To find next number 

 Let next number  = x

 x  - 54 = 21 + 5

x  = 54 + 26

x  = 80

Next number in the series is 80.