Adam's age is a multiple of 4 this year.
His age 2 years ago was a multiple of 5.
- What is Adam's age this year?
- What was Adam's age 4 years ago?
- What is Adam's age 5 years later?
Multiple of 4: 4, 8, 12
Multiple of 4 (-2): 2, 6, 10
Multiple of 5: 5, 10
10 appears in both the multiples of 4 (-2) and the multiples of 5.
Adam's age 2 years ago = 10
(a) Adam's age this year = 12
(b) Adam's age 4 year ago = 12 - 4 = 8
(c) Adam's age 4 years later = 12 + 5 = 17
Answer(s): (a) 12; (b) 8; (c) 17