Adam's age is a multiple of 3 this year.
His age 3 years later will be multiple of 7.
- What is Adam's age this year?
- What was Adam's age 7 years ago?
- What is Adam's age 5 years later?
Multiple(s) of 3: 3, 6, 9, 12, 15, 18
Multiple(s) of 3 (+3): 6, 9, 12, 15, 18, 21
Multiple(s) of 7: 7, 14, 21
21 appears in both the multiples of 7 and the multiples of 3 (+3).
21 is Adam's age 3 years later.
(a) Adam's age this year = 18
(b) Adam's age 7 year ago = 18 - 7 = 11
(c) Adam's age 3 years later = 18 + 5 = 23
Answer(s): (a) 18; (b) 11; (c) 23