Adam's age is a multiple of 3 this year.
His age next year will be multiple of 8.
Adam's age is between 10 and 20.
- What is Adam's age this year?
- What was Adam's age 7 years ago?
- What is Adam's age 6 years later?
Multiple of 3: 3, 6, 9, 12, 15
Multiple of 3 (+1): 4, 7, 10, 13, 16
Multiple of 8: 8, 16
16 appears in both the multiples of 3 (+1) and the multiples of 8.
(a) Adam's age this year = 15
(b) Adam's age 7 years ago = 15 - 7 = 8
(c) Adam's age 6 years later = 15 + 6 = 21
Answer(s): (a) 15; (b) 8; (c) 21