Adam's age is a multiple of 4 this year.
His age 3 years ago was a multiple of 7.
- What is Adam's age this year?
- What was Adam's age 8 years ago?
- What is Adam's age 2 years later?
Multiple of 4: 4, 8, 12, 16, 20, 24
Multiple of 4 (-3): 1, 5, 9, 13, 17, 21
Multiple of 7: 7, 14, 21
21 appears in both the multiples of 4 (-3) and the multiples of 7.
Adam's age 3 years ago = 21
(a) Adam's age this year = 24
(b) Adam's age 8 year ago = 24 - 8 = 16
(c) Adam's age 4 years later = 24 + 2 = 26
Answer(s): (a) 24; (b) 16; (c) 26