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Vennilaa

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

agamahilan

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Feb 5, 2023
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If you have a 7-minute hourglass and an 11-minute hourglass, how can you boil an egg in exactly 15 minutes?
1. Start both 7 and 11 minutes hourglass.
2. Once 7 minutes is over, upside down the 7 minute hourglass.
3. Once 11 minutes is over, upside down the 7 minute hourglass, as it should have already passed 4 minutes (7 + 4 = 11), so that the remaining 4 minutes can be counted.
4. Thats it, egg is boiled for 15 minutes 🥚⏳
 
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