Adam's age is a multiple of 5 this year.
His age next year will be multiple of 8.
Adam's age is between 10 and 20.
- What is Adam's age this year?
- What was Adam's age 10 years ago?
- What is Adam's age 6 years later?
Multiple of 5: 5, 10, 15
Multiple of 5 (+1): 6, 11, 16
Multiple of 8: 8, 16
16 appears in both the multiples of 5 (+1) and the multiples of 8.
(a) Adam's age this year = 15
(b) Adam's age 10 years ago = 15 - 10 = 5
(c) Adam's age 6 years later = 15 + 6 = 21
Answer(s): (a) 15; (b) 5; (c) 21