Adam's age is a multiple of 5 this year.
His age 4 years ago was a multiple of 8.
- What is Adam's age this year?
- What was Adam's age 4 years ago?
- What is Adam's age 6 years later?
Multiple of 5: 5, 10, 15, 20
Multiple of 5 (-4): 1, 6, 11, 16
Multiple of 8: 8, 16
16 appears in both the multiples of 5 (-4) and the multiples of 8.
Adam's age 4 years ago = 16
(a) Adam's age this year = 20
(b) Adam's age 4 year ago = 20 - 4 = 16
(c) Adam's age 5 years later = 20 + 6 = 26
Answer(s): (a) 20; (b) 16; (c) 26