Adam's age is a multiple of 9 this year.
His age 2 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 4 years ago?
- What is Adam's age 2 years later?
Multiple of 9: 9, 18
Multiple of 9 (-2): 7, 16
Multiples of 2: 2, 4, 6, 8, 10, 12, 14, 16
16 appears in both the multiples of 9 (-2) and the multiples of 2.
(a) Adam's age this year = 18
(b) Adam's age 4 year ago = 18 - 4 = 14
(c) Adam's age 2 years later = 18 + 2 = 20
Answer(s): (a) 18; (b) 14; (c) 20