Measure by Hourglass

It's a test that will check your IQ.

Suppose you have one 11 minute hourglass and one 13 minute hourglass.

Can you measure exactly fifteen minutes using them ?




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0 0 0 = 6
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2 2 2 = 6
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You can use any mathematical symbols in the space provided to make all above algebraic expressions true.

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Can you find out how many chocolates are there in P and Q respectively?

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