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ARC-Challenge / TIMSS_2003_8_pg87 / David makes a solution by dissolving 10 grams of salt in 100 ml of water. He…

Problem

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question

David makes a solution by dissolving 10 grams of salt in 100 ml of water. He wants a solution that is half as concentrated. What should he add to the original solution to obtain a solution that is about half as concentrated?

choices

  • 50 ml of water
  • 100 ml of water
  • 5 grams of salt
  • 10 grams of salt

Discussion

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Source and history

Official source

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