An odd number is a multiple of 3 and a factor of 84. The number is greater than 15 but less than 25. What is the number?
Multiple(s) of 3: 3, 6, 9, 12, 15, 18, 21
Factor(s) of 84: 1, 2, 3, 4, 6, 7, 12, 14, 21, 28, 42, 84
Common number that is greater than 15 but less than 25 = 21
Answer(s): 21