Multiple choice general knowledge math & puzzles 15 23 33 45 _ 59 58 56 60 Reveal answer Fill a bubble to check yourself A Correct answer Explanation The differences between the numbers are increasing by 2: 23-15=8, 33-23=10, 45-33=12. The next difference should be 14. 45 + 14 = 59. 58, 56, and 60 do not fit this arithmetic progression of differences.