Adam's age is a multiple of 5 this year.
His age 4 years ago was a multiple of 6.
- What is Adam's age this year?
- What was Adam's age 8 years ago?
- What is Adam's age 9 years later?
Multiple of 5: 5, 10
Multiple of 5 (-4): 1, 6
Multiple of 6: 6
6 appears in both the multiples of 5 (-4) and the multiples of 6.
Adam's age 4 years ago = 6
(a) Adam's age this year = 10
(b) Adam's age 8 year ago = 10 - 8 = 2
(c) Adam's age 5 years later = 10 + 9 = 19
Answer(s): (a) 10; (b) 2; (c) 19