Adam's age is a multiple of 7 this year.
His age 4 years later will be multiple of 10.
- What is Adam's age this year?
- What was Adam's age 9 years ago?
- What is Adam's age 7 years later?
Multiple(s) of 7: 7, 14, 21, 28, 35, 42, 49, 56
Multiple(s) of 7 (+4): 11, 18, 25, 32, 39, 46, 53, 60
Multiple(s) of 10: 10, 20, 30, 40, 50, 60
60 appears in both the multiples of 10 and the multiples of 7 (+4).
60 is Adam's age 4 years later.
(a) Adam's age this year = 56
(b) Adam's age 9 year ago = 56 - 9 = 47
(c) Adam's age 7 years later = 56 + 7 = 63
Answer(s): (a) 56; (b) 47; (c) 63