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• ## Puzzle: What fraction is shaded?0

There’s nothing like a great geometry puzzle to get the Internet into a frenzy.  Ed Southall, author of “Geometry Snacks,” shared a photo of a pink triangle inside of a square and challenged people to figure out how much of the square is shaded pink. Here’s the puzzle: What fraction is shaded? The Solution: According

• ## The 3 Switches Puzzle (and solution)0

Can you solve the “3 Switches” puzzle? You are in the basement of a house where there are are three identical on-off switches.  One of them controls a lamp in the attic, and two of them do nothing.  You have no way to see into the attic or to see reflected light from the attic.

• ## The Jewelry Box and the Ring [a riddle/puzzle]0

Can you figure out this brain teaser? At an auction, a woman’s ring and a jewelry box with a hand-painted ceramic top are on sale for \$200.   The jewelry box is valued at \$190 more than the ring.  How much is the ring worth?   Scroll down for the answer…

• ## The “Infinite Profit” Puzzle0

Let’s say I put \$20 in a box. Now you do the same. The box now contains \$40, and we’re both aware of this fact. Now, I sell you the box for \$30. We both walk away with \$10 profit. Repeat forever, and you’ve got an infinite supply of money. Wait, wut? At first glance,