Adam's age is a multiple of 9 this year.
His age 6 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 10 years ago?
- What is Adam's age 3 years later?
Multiple of 9: 9, 18, 27
Multiple of 9 (-6): 3, 12, 21
Multiples of 7: 7, 14, 21
21 appears in both the multiples of 9 (-6) and the multiples of 7.
(a) Adam's age this year = 27
(b) Adam's age 10 year ago = 27 - 10 = 17
(c) Adam's age 3 years later = 27 + 3 = 30
Answer(s): (a) 27; (b) 17; (c) 30