Adam's age is a multiple of 7 this year.
His age 4 years ago was a multiple of 9.
- What is Adam's age this year?
- What was Adam's age 4 years ago?
- What is Adam's age 3 years later?
Multiple of 7: 7, 14, 21, 28, 35, 42, 49
Multiple of 7 (-4): 3, 10, 17, 24, 31, 38, 45
Multiple of 9: 9, 18, 27, 36, 45
45 appears in both the multiples of 7 (-4) and the multiples of 9.
Adam's age 4 years ago = 45
(a) Adam's age this year = 49
(b) Adam's age 4 year ago = 49 - 4 = 45
(c) Adam's age 7 years later = 49 + 3 = 52
Answer(s): (a) 49; (b) 45; (c) 52