Adam's age is a multiple of 8 this year.
His age 4 years ago is a multiple of 3.
Adam's age is between 10 and 20.
- What is Adam's age this year?
- What is Adam's age 3 years ago?
- What is Adam's age 7 years later?
Multiple of 8: 8, 16
Multiple of 8 (-4): 4, 12
Multiples of 3: 3, 6, 9, 12
12 appears in both the multiples of 8 (-4) and the multiples of 3.
(a) Adam's age this year = 16
(b) Adam's age 3 year ago = 16 - 3 = 13
(c) Adam's age 7 years later = 16 + 7 = 23
Answer(s): (a) 16; (b) 13; (c) 23