Adam's age is a multiple of 4 this year.
His age 4 years later will be multiple of 5.
- What is Adam's age this year?
- What was Adam's age 5 years ago?
- What is Adam's age 7 years later?
Multiple(s) of 4: 4, 8, 12, 16
Multiple(s) of 4 (+4): 8, 12, 16, 20
Multiple(s) of 5: 5, 10, 15, 20
20 appears in both the multiples of 5 and the multiples of 4 (+4).
20 is Adam's age 4 years later.
(a) Adam's age this year = 16
(b) Adam's age 5 year ago = 16 - 5 = 11
(c) Adam's age 4 years later = 16 + 7 = 23
Answer(s): (a) 16; (b) 11; (c) 23