Adam's age is a multiple of 9 this year.
His age 7 years ago was a multiple of 7.
- What is Adam's age this year?
- What was Adam's age 5 years ago?
- What is Adam's age 6 years later?
Multiple of 9: 9, 18, 27, 36, 45, 54, 63
Multiple of 9 (-7): 2, 11, 20, 29, 38, 47, 56
Multiple of 7: 7, 14, 21, 28, 35, 42, 49, 56
56 appears in both the multiples of 9 (-7) and the multiples of 7.
Adam's age 7 years ago = 56
(a) Adam's age this year = 63
(b) Adam's age 5 year ago = 63 - 5 = 58
(c) Adam's age 9 years later = 63 + 6 = 69
Answer(s): (a) 63; (b) 58; (c) 69