Adam's age is a multiple of 7 this year.
His age 5 years ago was a multiple of 5.
- What is Adam's age this year?
- What was Adam's age 8 years ago?
- What is Adam's age 10 years later?
Multiple of 7: 7, 14, 21, 28, 35
Multiple of 7 (-5): 2, 9, 16, 23, 30
Multiple of 5: 5, 10, 15, 20, 25, 30
30 appears in both the multiples of 7 (-5) and the multiples of 5.
Adam's age 5 years ago = 30
(a) Adam's age this year = 35
(b) Adam's age 8 year ago = 35 - 8 = 27
(c) Adam's age 7 years later = 35 + 10 = 45
Answer(s): (a) 35; (b) 27; (c) 45