Adam's age is a multiple of 6 this year.
His age 4 years ago was a multiple of 10.
- What is Adam's age this year?
- What was Adam's age 8 years ago?
- What is Adam's age 8 years later?
Multiple of 6: 6, 12, 18, 24
Multiple of 6 (-4): 2, 8, 14, 20
Multiple of 10: 10, 20
20 appears in both the multiples of 6 (-4) and the multiples of 10.
Adam's age 4 years ago = 20
(a) Adam's age this year = 24
(b) Adam's age 8 year ago = 24 - 8 = 16
(c) Adam's age 6 years later = 24 + 8 = 32
Answer(s): (a) 24; (b) 16; (c) 32