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Magoosh - 数学PS - 60
Seven years ago Bob was k times as old as Ann. If Ann is now 11 years old, what is Bob's present age in terms of k?
  • A7 + 4k
  • B$$\frac{k}{11} + 7$$
  • C$$11 - \frac{7}{k}$$
  • D$$11 - \frac{k}{7}$$
  • E4k - 7
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正确答案: A

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