GRE数学试题

Jane has exactly 3 times as many Canadian as non Canadian stamps in her collection Which of the following CANNOT be the number of stamps in Jane's collection?

• A96

• B80

• C72

• D68

• E54

参考答案

lets x stands for non-Canadian stamps, so

the number of Canadian stamps is 3x

together Jane has x + 3x = 4x stamps..

so we have only to check if the numbers below are divided by 4 with no remainder

only 54 doen't divide by 4