Adam's age is a multiple of 9 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 8 years later?
Multiple(s) of 9: 9, 18
Multiple(s) of 9 (+3): 12, 21
Multiple(s) of 7: 7, 14, 21
21 appears in both the multiples of 7 and the multiples of 9 (+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 9 years later = 18 + 8 = 26
Answer(s): (a) 18; (b) 11; (c) 26