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一道数学真题
today rose is twice as old as sam and sam is 3 years younger than tina. if rose, sam,and tina are all alive 4 years from today, which of the following must be true on that day?
I. rose is twice as old as sam II. sam is 3 years younger than tina III. rose is older than tina
A) I only B) II only C) III only D) I and II E) II and III
请问,大家是怎么判断出III不是正确答案呢?正确答案是B。谢谢大家,能给个具体的推导过程吗?谢谢大家帮助笨笨的自由。 |
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