Adam's age is a multiple of 7 this year.
His age 2 years ago is a multiple of 3.
Adam's age is between 10 and 20.
- What is Adam's age this year?
- What is Adam's age 5 years ago?
- What is Adam's age 4 years later?
Multiple of 7: 7, 14
Multiple of 7 (-2): 5, 12
Multiples of 3: 3, 6, 9, 12
12 appears in both the multiples of 7 (-2) and the multiples of 3.
(a) Adam's age this year = 14
(b) Adam's age 5 year ago = 14 - 5 = 9
(c) Adam's age 4 years later = 14 + 4 = 18
Answer(s): (a) 14; (b) 9; (c) 18