Adam's age is a multiple of 8 this year.
His age 7 years ago was a multiple of 9.
- What is Adam's age this year?
- What was Adam's age 10 years ago?
- What is Adam's age 2 years later?
Multiple of 8: 8, 16
Multiple of 8 (-7): 1, 9
Multiple of 9: 9
9 appears in both the multiples of 8 (-7) and the multiples of 9.
Adam's age 7 years ago = 9
(a) Adam's age this year = 16
(b) Adam's age 10 year ago = 16 - 10 = 6
(c) Adam's age 8 years later = 16 + 2 = 18
Answer(s): (a) 16; (b) 6; (c) 18