Adam's age is a multiple of 5 this year.
His age 3 years later will be multiple of 6.
- 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 5: 5, 10, 15
Multiple(s) of 5 (+3): 8, 13, 18
Multiple(s) of 6: 6, 12, 18
18 appears in both the multiples of 6 and the multiples of 5 (+3).
18 is Adam's age 3 years later.
(a) Adam's age this year = 15
(b) Adam's age 4 year ago = 15 - 4 = 11
(c) Adam's age 5 years later = 15 + 6 = 21
Answer(s): (a) 15; (b) 11; (c) 21