Adam's age is a multiple of 4 this year.
His age 5 years later will be multiple of 7.
- What is Adam's age this year?
- What was Adam's age 3 years ago?
- What is Adam's age 3 years later?
Multiple(s) of 4: 4, 8, 12, 16
Multiple(s) of 4 (+5): 9, 13, 17, 21
Multiple(s) of 7: 7, 14, 21
21 appears in both the multiples of 7 and the multiples of 4 (+5).
21 is Adam's age 5 years later.
(a) Adam's age this year = 16
(b) Adam's age 3 year ago = 16 - 3 = 13
(c) Adam's age 4 years later = 16 + 3 = 19
Answer(s): (a) 16; (b) 13; (c) 19