Ben's age is a multiple of 9 this year. His age next year will be a multiple of 5. Ben is more than 50 years old. What is Ben's age this year?
Multiples of 9: 9, 18, 27, 36, 45, 54
Multiples of 9 (+1): 10, 19, 28, 37, 46, 55
Multiples of 5: 5, 10, 15, 20, 25, 30, 35, 40, 45, 50, 55
Common number = 55
Ben's age this year
= 55 - 1
= 54
Answer(s): 54
