Adam's age is a multiple of 6 this year.
His age 5 years ago was a multiple of 5.
- What is Adam's age this year?
- What was Adam's age 7 years ago?
- What is Adam's age 4 years later?
Multiple of 6: 6, 12, 18, 24, 30
Multiple of 6 (-5): 1, 7, 13, 19, 25
Multiple of 5: 5, 10, 15, 20, 25
25 appears in both the multiples of 6 (-5) and the multiples of 5.
Adam's age 5 years ago = 25
(a) Adam's age this year = 30
(b) Adam's age 7 year ago = 30 - 7 = 23
(c) Adam's age 6 years later = 30 + 4 = 34
Answer(s): (a) 30; (b) 23; (c) 34