Adam's age is a multiple of 10 this year.
His age 5 years later will be multiple of 7.
- What is Adam's age this year?
- What was Adam's age 3 years ago?
- What is Adam's age 7 years later?
Multiple(s) of 10: 10, 20, 30
Multiple(s) of 10 (+5): 15, 25, 35
Multiple(s) of 7: 7, 14, 21, 28, 35
35 appears in both the multiples of 7 and the multiples of 10 (+5).
35 is Adam's age 5 years later.
(a) Adam's age this year = 30
(b) Adam's age 3 year ago = 30 - 3 = 27
(c) Adam's age 10 years later = 30 + 7 = 37
Answer(s): (a) 30; (b) 27; (c) 37