Adam's age is a multiple of 10 this year.
His age 2 years later will be multiple of 9.
- What is Adam's age this year?
- What was Adam's age 7 years ago?
- What is Adam's age 7 years later?
Multiple(s) of 10: 10, 20, 30, 40, 50, 60, 70
Multiple(s) of 10 (+2): 12, 22, 32, 42, 52, 62, 72
Multiple(s) of 9: 9, 18, 27, 36, 45, 54, 63, 72
72 appears in both the multiples of 9 and the multiples of 10 (+2).
72 is Adam's age 2 years later.
(a) Adam's age this year = 70
(b) Adam's age 7 year ago = 70 - 7 = 63
(c) Adam's age 10 years later = 70 + 7 = 77
Answer(s): (a) 70; (b) 63; (c) 77