Adam's age is a multiple of 8 this year.
His age 3 years ago is a multiple of 7.
Adam's age is between 20 and 30.
- What is Adam's age this year?
- What is Adam's age 7 years ago?
- What is Adam's age 4 years later?
Multiple of 8: 8, 16, 24
Multiple of 8 (-3): 5, 13, 21
Multiples of 7: 7, 14, 21
21 appears in both the multiples of 8 (-3) and the multiples of 7.
(a) Adam's age this year = 24
(b) Adam's age 7 year ago = 24 - 7 = 17
(c) Adam's age 4 years later = 24 + 4 = 28
Answer(s): (a) 24; (b) 17; (c) 28