Adam's age is a multiple of 7 this year.
His age next year will be multiple of 9.
Adam's age is between 30 and 40.
- What is Adam's age this year?
- What was Adam's age 4 years ago?
- What is Adam's age 8 years later?
Multiple of 7: 7, 14, 21, 28, 35
Multiple of 7 (+1): 8, 15, 22, 29, 36
Multiple of 9: 9, 18, 27, 36
36 appears in both the multiples of 7 (+1) and the multiples of 9.
(a) Adam's age this year = 35
(b) Adam's age 4 years ago = 35 - 4 = 31
(c) Adam's age 8 years later = 35 + 8 = 43
Answer(s): (a) 35; (b) 31; (c) 43