15 minutes of sand
May 07, 2018
Sitting on your desk, there are two hourglasses (like the image to the left). One of the hourglasses has exactly 7 minutes of sand, while the other hourglass contains exactly 11 minutes of sand.
The problem is that you need to accurately time 15 minutes using only these two hourglasses.
How can you do it?
CLICK HERE TO VIEW THE SOLUTION (scroll past the new problem)
ANSWER FROM LAST WEEK:
There are 8 red balls, 10 green balls, and 12 white balls in the bag (8+10+12=30).
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