If you multiply me by 4, subtract 12, divide the result by 4, and finally add 3, you always get me back. What number am I?
Any number
Algebraically, the sequence of operations is ((4x - 12) / 4) + 3 = (x - 3) + 3 = x. This identity holds true for every real number.
About this riddle
Math riddles hide a calculation inside a short story. Pull out the numbers, work out what is being asked, and watch for a trick such as a unit change.
Difficulty: Medium. More like this: Math riddles with answers or try Target 24 for a different kind of puzzle.
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