Adam's age is a multiple of 8 this year.
His age 7 years ago was a multiple of 5.
- What is Adam's age this year?
- What was Adam's age 4 years ago?
- What is Adam's age 7 years later?
Multiple of 8: 8, 16, 24, 32
Multiple of 8 (-7): 1, 9, 17, 25
Multiple of 5: 5, 10, 15, 20, 25
25 appears in both the multiples of 8 (-7) and the multiples of 5.
Adam's age 7 years ago = 25
(a) Adam's age this year = 32
(b) Adam's age 4 year ago = 32 - 4 = 28
(c) Adam's age 8 years later = 32 + 7 = 39
Answer(s): (a) 32; (b) 28; (c) 39