I am an integer. If you multiply me by my next consecutive integer, the product is 210. What number am I?
14
Let the number be x. x(x + 1) = 210 => x^2 + x - 210 = 0. Factoring gives (x - 14)(x + 15) = 0. Since it's a positive context usually, or solving for 14 * 15 = 210.
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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