If you multiply me by my own square root, the result is 125. What number am I?
25
Let the number be x. x times sqrt(x) is x^(3/2) = 125. Squaring both sides gives x^3 = 15625, and the cube root of 15625 is 25. Alternatively, 25 * 5 = 125.
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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