Happy Brains Daily Riddles, Day 11 is sure to make you have some fun. It is quite simple.
![hourglass pzzle](http://makehappyfoundation.com/wp-content/uploads/2018/05/hourglass-puzzle.jpg)
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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