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easy · GMAT Quantitative Reasoning

A mixture contains sand and gravel in the ratio 4:7 by weight. After 15 kg of sand are added, the ratio of sand to gravel becomes 1:1.

How many kilograms of gravel are in the mixture?

  1. 20
  2. 28
  3. 35
  4. 45
  5. 15

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