GRE数学年龄问题解析

　　Age problems ask you to compare ages of two or more people at different points in time. In solving age problems, you might have to represent a person's age at the present time, several years from now, or several years ago. Any age problem allows you to set up an equation to relate the ages of two or more people, as in the following examples:

　　(1) If A is 5 years younger than B at the present time, you can express the relationship between A's age and B's age as A=B-5 (or A+5=B)

　　(2) Ten years ago, if X was twice as old as Y, you can express the relationship between their ages as 2 (Y-10)=X-10, where X and Y are the present ages of X and Y.去看看GRE数学归纳法讲解

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