Adam's age is a multiple of 9 this year.
His age 3 years ago is a multiple of 4.
Adam's age is between 20 and 30.
- What is Adam's age this year?
- What is Adam's age 4 years ago?
- What is Adam's age 4 years later?
Multiple of 9: 9, 18, 27
Multiple of 9 (-3): 6, 15, 24
Multiples of 4: 4, 8, 12, 16, 20, 24
24 appears in both the multiples of 9 (-3) and the multiples of 4.
(a) Adam's age this year = 27
(b) Adam's age 4 year ago = 27 - 4 = 23
(c) Adam's age 4 years later = 27 + 4 = 31
Answer(s): (a) 27; (b) 23; (c) 31