摘要：
A long-distance telephone company charges its customers by the following rules:Making a long-distance call costs a certain amount per minute, dependin... 阅读全文
摘要：
Suppose a bank has N windows open for service. There is a yellow line in front of the windows which devides the waiting area into two parts. The rules... 阅读全文
摘要：
With the 2010 FIFA World Cup running, football fans the world over were becoming increasingly excited as the best players from the best teams doing ba... 阅读全文
摘要：
Given a pair of positive integers, for example, 6 and 110, can this equation 6 = 110 be true? The answer is "yes", if 6 is a decimal number and 110 is... 阅读全文