Bryan goes to the gym every 2 days.
Adam goes to the gym every 3 days.
Charlie goes to the gym every 9 days.
If they meet one another today, how many days later will they meet again?
Multiples of 2: 2, 4, 6, 8, 10, 12, 14, 16, 18
Multiples of 3: 3, 6, 9, 12, 15, 18
Multiples of 9: 9, 18
Number of days later that they will meet again = 18
Answer(s): 18