Adam's age is a multiple of 10 this year.
His age 3 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 5 years later?
Multiple(s) of 10: 10, 20, 30, 40, 50, 60
Multiple(s) of 10 (+3): 13, 23, 33, 43, 53, 63
Multiple(s) of 9: 9, 18, 27, 36, 45, 54, 63
63 appears in both the multiples of 9 and the multiples of 10 (+3).
63 is Adam's age 3 years later.
(a) Adam's age this year = 60
(b) Adam's age 7 year ago = 60 - 7 = 53
(c) Adam's age 10 years later = 60 + 5 = 65
Answer(s): (a) 60; (b) 53; (c) 65