Adam's age is a multiple of 7 this year.
His age 3 years ago was a multiple of 3.
- What is Adam's age this year?
- What was Adam's age 7 years ago?
- What is Adam's age 10 years later?
Multiple of 7: 7, 14, 21
Multiple of 7 (-3): 4, 11, 18
Multiple of 3: 3, 6, 9, 12, 15, 18
18 appears in both the multiples of 7 (-3) and the multiples of 3.
Adam's age 3 years ago = 18
(a) Adam's age this year = 21
(b) Adam's age 7 year ago = 21 - 7 = 14
(c) Adam's age 7 years later = 21 + 10 = 31
Answer(s): (a) 21; (b) 14; (c) 31