Adam's age is a multiple of 6 this year.
His age 3 years later will be multiple of 7.
- What is Adam's age this year?
- What was Adam's age 4 years ago?
- What is Adam's age 6 years later?
Multiple(s) of 6: 6, 12, 18
Multiple(s) of 6 (+3): 9, 15, 21
Multiple(s) of 7: 7, 14, 21
21 appears in both the multiples of 7 and the multiples of 6 (+3).
21 is Adam's age 3 years later.
(a) Adam's age this year = 18
(b) Adam's age 4 year ago = 18 - 4 = 14
(c) Adam's age 6 years later = 18 + 6 = 24
Answer(s): (a) 18; (b) 14; (c) 24