Problem:
Danica wants to arrange her model cars in rows with exactly cars in each row. She now has model cars. What is the smallest number of additional cars she must buy in order to be able to arrange her cars in this way?
Answer Choices:
A.
B.
C.
D.
E.
Solution:
The smallest multiple of that is at least is , so Danica must buy additional car.
Answer: .
The problems on this page are the property of the MAA's American Mathematics Competitions