Here's the brain teaser - make the math equation correct by moving just one of the 15 straws. (Source: WMBF News)
Here's the solution - you move one of the straws from the "II" to form a "plus" sign in the middle of the "III," making it: "1+1+1+1=4" - easy! (Source: WMBF News)
MYRTLE BEACH, SC (WMBF) – Here’s a brain teaser one of our employees recently learned while on a cruise.
Fifteen straws are laid out to make the mathematical expression: I + II + III = 4
By moving only one straw, how do you make that expression mathematically correct? You can't add or remove any straws - you can only move one.
Give up? You’ll be kicking yourself once you see the solution.
The answer is: move one of the straws forming the “II” to make a “plus” sign out of the middle straw that formed the “III.”
The expression then becomes: 1 + 1 + 1 + 1 = 4, which is both mathematically correct, and using consistent numerical figures, as opposed to the mix of Arabic and Roman numerals.
One of our employees had an alternate solution – move any of the straws to make the “=” a “≠,” or “does not equal” sign – but that’s a bit of cheat, don’t you think? Did you come up with a different solution?