Puzzle: Given two hour glass, one measuring 4 mins and the other 7 mins, how to measure 9 mins

Anonymous
1y

1. At 0 minutes- Start both hourglasses at the same time 2. At 4 minutes - 4 minutes hourglass runs out and flip it . 7 minutes hourglass is left with 3 minutes 3. At 7 minutes - 4 minutes hourglass i...read more

Anonymous
2y

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