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Day 1

Day 1. 5-Minutes. The Candles Problem. (Driscoll, 1999). Maria has a red candle and a green candle. Each candle is 18 centimeters long. Maria lights each candle at the same time. The red candle takes 6 hours to burn out, but the green candle takes 3 hours to burn out.

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Day 1

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  1. Day 1 5-Minutes

  2. The Candles Problem (Driscoll, 1999) • Maria has a red candle and a green candle. Each candle is 18 centimeters long. Maria lights each candle at the same time. The red candle takes 6 hours to burn out, but the green candle takes 3 hours to burn out. • After one hour of burning, which candle is longer? How much longer?

  3. Day 2 5-Minutes

  4. The Candles Problem (Driscoll, 1999) • Maria has a red candle and a green candle. Each candle is 18 centimeters long. Maria lights each candle at the same time. The red candle takes 6 hours to burn out, but the green candle takes 3 hours to burn out. • How much time will pass until one of the candles is exactly twice as long as the other?

  5. Day 3 5-Minutes

  6. The Candles Problem (Driscoll, 1999) • Maria lights two candles at the same time. Each Candle is 36 centimeters long. One candle takes 3 hours to burn out and the other takes 6 hours to burn out. • How much time will pass until the slower-burning candle is exactly twice as long as the faster-burning one?

  7. Day 4 5-10 minutes

  8. The Candles Problem (Driscoll, 1999) • Maria lights two candles of equal length at the same time. One candle takes 6 hours to burn out and the other takes 9. • How much time will pass until the slower-burning candle is exactly twice as long as the faster-burning one?

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