Adam's age is a multiple of 4 this year.
His age 3 years later will be multiple of 5.
- What is Adam's age this year?
- What was Adam's age 2 years ago?
- What is Adam's age 4 years later?
Multiple(s) of 4: 4, 8, 12
Multiple(s) of 4 (+3): 7, 11, 15
Multiple(s) of 5: 5, 10, 15
15 appears in both the multiples of 5 and the multiples of 4 (+3).
15 is Adam's age 3 years later.
(a) Adam's age this year = 12
(b) Adam's age 2 year ago = 12 - 2 = 10
(c) Adam's age 4 years later = 12 + 4 = 16
Answer(s): (a) 12; (b) 10; (c) 16