Adam's age is a multiple of 7 this year.
His age 4 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 2 years later?
Multiple(s) of 7: 7, 14, 21
Multiple(s) of 7 (+4): 11, 18, 25
Multiple(s) of 5: 5, 10, 15, 20, 25
25 appears in both the multiples of 5 and the multiples of 7 (+4).
25 is Adam's age 4 years later.
(a) Adam's age this year = 21
(b) Adam's age 2 year ago = 21 - 2 = 19
(c) Adam's age 7 years later = 21 + 2 = 23
Answer(s): (a) 21; (b) 19; (c) 23