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  • Puzzle:  What fraction is shaded?

    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

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  • The 3 Switches Puzzle (and solution)

    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.

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

    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…        

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  • The “Infinite Profit” Puzzle

    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,

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  • The Hidden Tiger Puzzle

    The Hidden Tiger Puzzle3

    The Hidden Tiger Puzzle… This optical illusion was created by American wildlife artist Rusty Rust. It shows a majestic Bengal Tiger standing in a bamboo forest.  Your mission, should you choose to accept it, is to find “the hidden tiger” in the image below. Source: http://puzzles4you.blogspot.ca/2011/07/hidden-tiger-puzzle.html

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  • 8 Marbles and a Balance Scale Puzzle

    8 Marbles and a Balance Scale Puzzle3

    PUZZLE Let’s say you have 8 marbles and a two-pan balance. All of the marbles look the same. Each marble weighs 2.0 grams except for one, which is slightly heavier at 2.05 grams. How would you find the heaviest marble if you are only allowed to weigh the marbles 2 times using the balance scale?

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