Adam's age is a multiple of 7 this year.
His age 2 years ago was a multiple of 10.
- What is Adam's age this year?
- What was Adam's age 9 years ago?
- What is Adam's age 8 years later?
Multiple of 7: 7, 14, 21, 28, 35, 42
Multiple of 7 (-2): 5, 12, 19, 26, 33, 40
Multiple of 10: 10, 20, 30, 40
40 appears in both the multiples of 7 (-2) and the multiples of 10.
Adam's age 2 years ago = 40
(a) Adam's age this year = 42
(b) Adam's age 9 year ago = 42 - 9 = 33
(c) Adam's age 7 years later = 42 + 8 = 50
Answer(s): (a) 42; (b) 33; (c) 50