# Hourglasses puzzle

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You have two hourglasses. One measured 7 minutes and the other 11 minutes.
How will you measure the 15 minutes using only these two hourglasses? Now here’s the twist you are only allowed to turn the hourglasses a total two times mean you can turn any of the glass two times or both the hourglasses one time each.

anikam Expert Asked on 22nd August 2015 in

Start both the hourglasses. The 7 minutes will be finished first. Immediately turn it upside down.When the hourglass with 11 minutes is finished (after 11 minutes).the second glass will still have sand for 3 minutes turn it upside down immediately .So now the sand will fall for 15 more minutes.(11+7-3).

pnikam Expert Answered on 22nd August 2015.

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