Adam's age is a multiple of 3 this year.
His age 5 years later will be multiple of 10.
- What is Adam's age this year?
- What was Adam's age 4 years ago?
- What is Adam's age 5 years later?
Multiple(s) of 3: 3, 6, 9, 12, 15
Multiple(s) of 3 (+5): 8, 11, 14, 17, 20
Multiple(s) of 10: 10, 20
20 appears in both the multiples of 10 and the multiples of 3 (+5).
20 is Adam's age 5 years later.
(a) Adam's age this year = 15
(b) Adam's age 4 year ago = 15 - 4 = 11
(c) Adam's age 3 years later = 15 + 5 = 20
Answer(s): (a) 15; (b) 11; (c) 20