Adam's age is a multiple of 7 this year.
His age next year will be multiple of 11.
Adam's age is between 20 and 30.
- What is Adam's age this year?
- What was Adam's age 4 years ago?
- What is Adam's age 2 years later?
Multiple of 7: 7, 14, 21
Multiple of 7 (+1): 8, 15, 22
Multiple of 11: 11, 22
22 appears in both the multiples of 7 (+1) and the multiples of 11.
(a) Adam's age this year = 21
(b) Adam's age 4 years ago = 21 - 4 = 17
(c) Adam's age 2 years later = 21 + 2 = 23
Answer(s): (a) 21; (b) 17; (c) 23