Adam's age is a multiple of 10 this year.
His age 8 years ago was a multiple of 7.
- What is Adam's age this year?
- What was Adam's age 5 years ago?
- What is Adam's age 5 years later?
Multiple of 10: 10, 20, 30, 40, 50
Multiple of 10 (-8): 2, 12, 22, 32, 42
Multiple of 7: 7, 14, 21, 28, 35, 42
42 appears in both the multiples of 10 (-8) and the multiples of 7.
Adam's age 8 years ago = 42
(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 + 5 = 55
Answer(s): (a) 50; (b) 45; (c) 55