Adam's age is a multiple of 9 this year.
His age next year will be multiple of 11.
Adam's age is between 50 and 60.
- What is Adam's age this year?
- What was Adam's age 9 years ago?
- What is Adam's age 4 years later?
Multiple of 9: 9, 18, 27, 36, 45, 54
Multiple of 9 (+1): 10, 19, 28, 37, 46, 55
Multiple of 11: 11, 22, 33, 44, 55
55 appears in both the multiples of 9 (+1) and the multiples of 11.
(a) Adam's age this year = 54
(b) Adam's age 9 years ago = 54 - 9 = 45
(c) Adam's age 4 years later = 54 + 4 = 58
Answer(s): (a) 54; (b) 45; (c) 58