Adam's age is a multiple of 4 this year.
His age 2 years ago is a multiple of 7.
Adam's age is between 10 and 20.
- What is Adam's age this year?
- What is Adam's age 10 years ago?
- What is Adam's age 4 years later?
Multiple of 4: 4, 8, 12, 16
Multiple of 4 (-2): 2, 6, 10, 14
Multiples of 7: 7, 14
14 appears in both the multiples of 4 (-2) and the multiples of 7.
(a) Adam's age this year = 16
(b) Adam's age 10 year ago = 16 - 10 = 6
(c) Adam's age 4 years later = 16 + 4 = 20
Answer(s): (a) 16; (b) 6; (c) 20