Adam's age is a multiple of 10 this year.
His age 5 years ago was a multiple of 9.
- What is Adam's age this year?
- What was Adam's age 5 years ago?
- What is Adam's age 6 years later?
Multiple of 10: 10, 20, 30, 40, 50
Multiple of 10 (-5): 5, 15, 25, 35, 45
Multiple of 9: 9, 18, 27, 36, 45
45 appears in both the multiples of 10 (-5) and the multiples of 9.
Adam's age 5 years ago = 45
(a) Adam's age this year = 50
(b) Adam's age 5 year ago = 50 - 5 = 45
(c) Adam's age 10 years later = 50 + 6 = 56
Answer(s): (a) 50; (b) 45; (c) 56