Adam's age is a multiple of 10 this year.
His age 7 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 9 years later?
Multiple of 10: 10
Multiple of 10 (-7): 3
Multiple of 3: 3
3 appears in both the multiples of 10 (-7) and the multiples of 3.
Adam's age 7 years ago = 3
(a) Adam's age this year = 10
(b) Adam's age 7 year ago = 10 - 7 = 3
(c) Adam's age 10 years later = 10 + 9 = 19
Answer(s): (a) 10; (b) 3; (c) 19