Adam's age is a multiple of 7 this year.
His age 4 years ago is a multiple of 8.
Adam's age is between 20 and 30.
- What is Adam's age this year?
- What is Adam's age 8 years ago?
- What is Adam's age 8 years later?
Multiple of 7: 7, 14, 21, 28
Multiple of 7 (-4): 3, 10, 17, 24
Multiples of 8: 8, 16, 24
24 appears in both the multiples of 7 (-4) and the multiples of 8.
(a) Adam's age this year = 28
(b) Adam's age 8 year ago = 28 - 8 = 20
(c) Adam's age 8 years later = 28 + 8 = 36
Answer(s): (a) 28; (b) 20; (c) 36