Mark is older than Frank, but younger than David. If m, f, and d represent the ages, in ye

Mark is older than Frank, but younger than David. If m, f, and d represent the ages, in years, of Mark, Frank, and David, respectively, which of the following is true?

______d<f<m

______f<m<d

______d<m<f

______f<d<m

请帮忙给出正确答案和分析,谢谢!

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  • 提问人:00****65
  • 发布时间:2018-08-16

2018-08-16 12:18   

正确答案:You are given that Mark m is older than Frank f. Therefore f<m. You are also given that Mark m is younger than David d. Therefore d>m. Mark's age is between Frank and David's ages so f<m<d.
You are given that Mark, m, is older than Frank, f. Therefore, f<m. You are also given that Mark, m, is younger than David, d. Therefore, d>m. Mark's age is between Frank and David's ages, so f<m<d.

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