Adam's age is a multiple of 10 this year.
His age 4 years ago was a multiple of 8.
- What is Adam's age this year?
- What was Adam's age 2 years ago?
- What is Adam's age 3 years later?
Multiple of 10: 10, 20
Multiple of 10 (-4): 6, 16
Multiple of 8: 8, 16
16 appears in both the multiples of 10 (-4) and the multiples of 8.
Adam's age 4 years ago = 16
(a) Adam's age this year = 20
(b) Adam's age 2 year ago = 20 - 2 = 18
(c) Adam's age 10 years later = 20 + 3 = 23
Answer(s): (a) 20; (b) 18; (c) 23