Adam's age is a multiple of 10 this year.
His age 4 years later will be multiple of 3.
- What is Adam's age this year?
- What was Adam's age 8 years ago?
- What is Adam's age 10 years later?
Multiple(s) of 10: 10, 20
Multiple(s) of 10 (+4): 14, 24
Multiple(s) of 3: 3, 6, 9, 12, 15, 18, 21, 24
24 appears in both the multiples of 3 and the multiples of 10 (+4).
24 is Adam's age 4 years later.
(a) Adam's age this year = 20
(b) Adam's age 8 year ago = 20 - 8 = 12
(c) Adam's age 10 years later = 20 + 10 = 30
Answer(s): (a) 20; (b) 12; (c) 30