GMAT Problem Solving

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Source: Manhattan

Level: 3

The ratio of South Korean aircraft to North Korean aircraft was 1 to 3. After the North announced it would acquire nuclear weapons, the U.S. transferred 60 aircraft to South Korea. Then, the ratio became 3 to 5. What was the total number of the aircraft on the Korean peninsula after the U.S. aircraft transfer?

  • A 120
  • B 135
  • C 225
  • D 300
  • E 360

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