Adam's age is a multiple of 9 this year.
His age 3 years ago is a multiple of 7.
Adam's age is between 40 and 50.
- What is Adam's age this year?
- What is Adam's age 5 years ago?
- What is Adam's age 7 years later?
Multiple of 9: 9, 18, 27, 36, 45
Multiple of 9 (-3): 6, 15, 24, 33, 42
Multiples of 7: 7, 14, 21, 28, 35, 42
42 appears in both the multiples of 9 (-3) and the multiples of 7.
(a) Adam's age this year = 45
(b) Adam's age 5 year ago = 45 - 5 = 40
(c) Adam's age 7 years later = 45 + 7 = 52
Answer(s): (a) 45; (b) 40; (c) 52