SAT Math Multiple Choice Question 710: Answer and Explanation

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Question: 710

5. The bird department of a pet store has 12 canaries, 30 finches, and 18 parrots. If the pet store purchased n more finches, then 80% of its birds would be finches. Which of the following equations must be true?

  • A. Images
  • B. Images
  • C. Images
  • D. Images

Correct Answer: C



Algebra (expressing relationships) MEDIUM-HARD

The portion of the birds that are finches is just the number of finches divided by the total number of birds. Since there are already 30 finches, adding n finches makes 30 + n finches. Since there are already 12 + 30 + 18 = 60 total birds, adding n finches makes 60 + n total birds.

Since Images.

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