Adam's age is a multiple of 7 this year.
His age 3 years later will be multiple of 8.
- What is Adam's age this year?
- What was Adam's age 8 years ago?
- What is Adam's age 9 years later?
Multiple(s) of 7: 7, 14, 21
Multiple(s) of 7 (+3): 10, 17, 24
Multiple(s) of 8: 8, 16, 24
24 appears in both the multiples of 8 and the multiples of 7 (+3).
24 is Adam's age 3 years later.
(a) Adam's age this year = 21
(b) Adam's age 8 year ago = 21 - 8 = 13
(c) Adam's age 7 years later = 21 + 9 = 30
Answer(s): (a) 21; (b) 13; (c) 30