Adam's age is a multiple of 9 this year.
His age 6 years ago was a multiple of 5.
- What is Adam's age this year?
- What was Adam's age 8 years ago?
- What is Adam's age 6 years later?
Multiple of 9: 9, 18, 27, 36
Multiple of 9 (-6): 3, 12, 21, 30
Multiple of 5: 5, 10, 15, 20, 25, 30
30 appears in both the multiples of 9 (-6) and the multiples of 5.
Adam's age 6 years ago = 30
(a) Adam's age this year = 36
(b) Adam's age 8 year ago = 36 - 8 = 28
(c) Adam's age 9 years later = 36 + 6 = 42
Answer(s): (a) 36; (b) 28; (c) 42