Adam's age is a multiple of 9 this year.
His age 2 years later will be multiple of 5.
- What is Adam's age this year?
- What was Adam's age 10 years ago?
- What is Adam's age 7 years later?
Multiple(s) of 9: 9, 18
Multiple(s) of 9 (+2): 11, 20
Multiple(s) of 5: 5, 10, 15, 20
20 appears in both the multiples of 5 and the multiples of 9 (+2).
20 is Adam's age 2 years later.
(a) Adam's age this year = 18
(b) Adam's age 10 year ago = 18 - 10 = 8
(c) Adam's age 9 years later = 18 + 7 = 25
Answer(s): (a) 18; (b) 8; (c) 25