Question

identify a problem in the giving list the numbers then use this pattern to find the next number 9, 20, 31, 42, 53

Answer 1

I think we're to identify the pattern in the given list.

9 20 31 42 53

First differences:

20-9=11
31-20=11
42-31=11
53-42=11

The next number must be 53+11=64