Adam's age is a multiple of 7 this year.
His age 4 years ago is a multiple of 9.
Adam's age is between 40 and 50.
- What is Adam's age this year?
- What is Adam's age 2 years ago?
- What is Adam's age 10 years later?
Multiple of 7: 7, 14, 21, 28, 35, 42, 49
Multiple of 7 (-4): 3, 10, 17, 24, 31, 38, 45
Multiples of 9: 9, 18, 27, 36, 45
45 appears in both the multiples of 7 (-4) and the multiples of 9.
(a) Adam's age this year = 49
(b) Adam's age 2 year ago = 49 - 2 = 47
(c) Adam's age 10 years later = 49 + 10 = 59
Answer(s): (a) 49; (b) 47; (c) 59