Problem:
What is (20−(2010−201))+(2010−(201−20))?
Answer Choices:
A. −4020
B. 0
C. 40
D. 401
E. 4020
Solution:
Distributing the negative signs gives
(20−(2010−201))+(2010−(201−20))=20−2010+201+2010−201+20=40.
The problems on this page are the property of the MAA's American Mathematics Competitions