Adam's age is a multiple of 10 this year.
His age 4 years later will be multiple of 9.
- What is Adam's age this year?
- What was Adam's age 6 years ago?
- What is Adam's age 9 years later?
Multiple(s) of 10: 10, 20, 30, 40, 50
Multiple(s) of 10 (+4): 14, 24, 34, 44, 54
Multiple(s) of 9: 9, 18, 27, 36, 45, 54
54 appears in both the multiples of 9 and the multiples of 10 (+4).
54 is Adam's age 4 years later.
(a) Adam's age this year = 50
(b) Adam's age 6 year ago = 50 - 6 = 44
(c) Adam's age 10 years later = 50 + 9 = 59
Answer(s): (a) 50; (b) 44; (c) 59