Adam's age is a multiple of 3 this year.
His age next year will be multiple of 11.
Adam's age is between 20 and 30.
- What is Adam's age this year?
- What was Adam's age 9 years ago?
- What is Adam's age 9 years later?
Multiple of 3: 3, 6, 9, 12, 15, 18, 21
Multiple of 3 (+1): 4, 7, 10, 13, 16, 19, 22
Multiple of 11: 11, 22
22 appears in both the multiples of 3 (+1) and the multiples of 11.
(a) Adam's age this year = 21
(b) Adam's age 9 years ago = 21 - 9 = 12
(c) Adam's age 9 years later = 21 + 9 = 30
Answer(s): (a) 21; (b) 12; (c) 30