Adam's age is a multiple of 6 this year.
His age 4 years ago was a multiple of 7.
- What is Adam's age this year?
- What was Adam's age 3 years ago?
- What is Adam's age 10 years later?
Multiple of 6: 6, 12, 18
Multiple of 6 (-4): 2, 8, 14
Multiple of 7: 7, 14
14 appears in both the multiples of 6 (-4) and the multiples of 7.
Adam's age 4 years ago = 14
(a) Adam's age this year = 18
(b) Adam's age 3 year ago = 18 - 3 = 15
(c) Adam's age 6 years later = 18 + 10 = 28
Answer(s): (a) 18; (b) 15; (c) 28