2. 外语
  3. Kathy was twice as old as Jim 2 years ago. Today, Jim is j years old. In terms of j, how old was Kathy 2 years ago? ______2(j

Kathy was twice as old as Jim 2 years ago. Today, Jim is j years old. In terms of j, how old was Kathy 2 years ago? ______2(j

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问题 Kathy was twice as old as Jim 2 years ago. Today, Jim is j years old. In terms of j, how old was Kathy 2 years ago?
   ______2(j-2)
   ______2j-2
   ______2(j+2)
   ______j(2+2)
选项
答案 You are given that Jim is j years old today; therefore, 2 years ago Jim would have been j-2 years old. At that time, Kathy was twice as old as Jim, or 2(j-2).
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