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Anita is 4 times older than Frank. In 5 years, Anita will be 3 times as old as Frank. Find their present ages.

  • 初等代数
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  • 微积分入门
  • 微积分
  • 函数
  • 线性代数
  • 三角
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解答

Anitais4timesolderthanFrank.In5years,Anitawillbe3timesasoldasFrank.Findtheirpresentages.

解答

Frank′sageis:10
Anita′sageis:40
求解步骤
Translate the problem into an equation:4x+5=3(x+5)
求解 x,4x+5=3(x+5):x=10
找到 age
Frank′sageis:10
Anita′sageis:40

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