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Advanced Placement (AP)Advanced Placement (AP)
1 November, 23:44

If you have a 7-minute hourglass and an 11-minute hourglass, how can you boil an egg in exactly 15 minutes?

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  1. 2 November, 00:06
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    To boil the egg in exactly 15 minutes, follow these steps.

    1. Start both hourglasses as you start boiling the egg.

    2. After the 7-minute hourglass runs out, turn it to start it again.

    3. Four minutes later, when the 11-minute hourglass runs out, turn the 7-minute hourglass again.

    4. Wait for the 7-minute hourglass to run out, which will take another four minutes and get you to exactly 15 minutes of boiling time.
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