Adam's age is a multiple of 7 this year.
His age 4 years later will be multiple of 8.
- What is Adam's age this year?
- What was Adam's age 10 years ago?
- What is Adam's age 3 years later?
Multiple(s) of 7: 7, 14, 21, 28
Multiple(s) of 7 (+4): 11, 18, 25, 32
Multiple(s) of 8: 8, 16, 24, 32
32 appears in both the multiples of 8 and the multiples of 7 (+4).
32 is Adam's age 4 years later.
(a) Adam's age this year = 28
(b) Adam's age 10 year ago = 28 - 10 = 18
(c) Adam's age 7 years later = 28 + 3 = 31
Answer(s): (a) 28; (b) 18; (c) 31