Adam's age is a multiple of 5 this year.
His age 4 years ago is a multiple of 7.
Adam's age is between 20 and 30.
- What is Adam's age this year?
- What is Adam's age 5 years ago?
- What is Adam's age 2 years later?
Multiple of 5: 5, 10, 15, 20, 25
Multiple of 5 (-4): 1, 6, 11, 16, 21
Multiples of 7: 7, 14, 21
21 appears in both the multiples of 5 (-4) and the multiples of 7.
(a) Adam's age this year = 25
(b) Adam's age 5 year ago = 25 - 5 = 20
(c) Adam's age 2 years later = 25 + 2 = 27
Answer(s): (a) 25; (b) 20; (c) 27