Adam's age is a multiple of 7 this year.
His age 4 years ago was a multiple of 4.
- What is Adam's age this year?
- What was Adam's age 10 years ago?
- What is Adam's age 8 years later?
Multiple of 7: 7, 14, 21, 28
Multiple of 7 (-4): 3, 10, 17, 24
Multiple of 4: 4, 8, 12, 16, 20, 24
24 appears in both the multiples of 7 (-4) and the multiples of 4.
Adam's age 4 years ago = 24
(a) Adam's age this year = 28
(b) Adam's age 10 year ago = 28 - 10 = 18
(c) Adam's age 7 years later = 28 + 8 = 36
Answer(s): (a) 28; (b) 18; (c) 36