Adam's age is a multiple of 7 this year.
His age 5 years ago was a multiple of 8.
- What is Adam's age this year?
- What was Adam's age 6 years ago?
- What is Adam's age 9 years later?
Multiple of 7: 7, 14, 21
Multiple of 7 (-5): 2, 9, 16
Multiple of 8: 8, 16
16 appears in both the multiples of 7 (-5) and the multiples of 8.
Adam's age 5 years ago = 16
(a) Adam's age this year = 21
(b) Adam's age 6 year ago = 21 - 6 = 15
(c) Adam's age 7 years later = 21 + 9 = 30
Answer(s): (a) 21; (b) 15; (c) 30