【GMAT考满分数学PS题库】If Sam were twice as old as he is, he would be 40 _真题_答案_解析 GMAT考满分官网

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题目内容

If Sam were twice as old as he is, he would be 40 years older than Jim. If Jim is 10 years younger than Sam, how old is Sam?

A20
B30
C40
D50
E60

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正确答案: B

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