Adam's age is a multiple of 5 this year.
His age 3 years ago was a multiple of 4.
- What is Adam's age this year?
- What was Adam's age 3 years ago?
- What is Adam's age 8 years later?
Multiple of 5: 5, 10, 15
Multiple of 5 (-3): 2, 7, 12
Multiple of 4: 4, 8, 12
12 appears in both the multiples of 5 (-3) and the multiples of 4.
Adam's age 3 years ago = 12
(a) Adam's age this year = 15
(b) Adam's age 3 year ago = 15 - 3 = 12
(c) Adam's age 5 years later = 15 + 8 = 23
Answer(s): (a) 15; (b) 12; (c) 23