Adam's age is a multiple of 9 this year.
His age 6 years ago is a multiple of 2.
Adam's age is between 10 and 20.
- What is Adam's age this year?
- What is Adam's age 8 years ago?
- What is Adam's age 9 years later?
Multiple of 9: 9, 18
Multiple of 9 (-6): 3, 12
Multiples of 2: 2, 4, 6, 8, 10, 12
12 appears in both the multiples of 9 (-6) and the multiples of 2.
(a) Adam's age this year = 18
(b) Adam's age 8 year ago = 18 - 8 = 10
(c) Adam's age 9 years later = 18 + 9 = 27
Answer(s): (a) 18; (b) 10; (c) 27