Comments to article «10 Riddles Only the Smartest People Can Solve»

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The second riddle's solution is wrong, if you turn over both hourglasses then turn over the 11 minutes hourglass once all the sand in the 7 minutes hourglass is at the bottom, and then turn over the 7 minutes hourglass too, you get 14 minutes if you started boiling the egg when you first turned over both hourglasses.
The correct answer is: first you need to make sure that all the sand is at the bottom in both hourglasses, then you turn over both hourglasses at the same time, the moment all the sand in the smaller hourglass is at the bottom - you start boiling the egg, since 7 minutes have passed, the time left in the big hourglass is exactly 4 minutes, once all the sand is at the bottom you turn over the 11 minutes hourglass, and once the sand is at the bottom, the egg is done.
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