I found this question in my math packet once too. I dug it up and found it was multiple choice, so just match it up with the answers.
33, 40, 47, 49, 53
Match them and see.
49, 29, 9, 40, 22, 15, 53, 33, 13, 47
Does 53 work? Doesn't match with 49, 29, 9, 40, 22, 53, 33, 13, 47
Does 49 work? Doesn't match with 49, 29,9, 40, 22,53,33, 13, 47
Does 47 work? It matches! Solution found lol.
Yay!