I am a three-digit number. My hundreds digit is twice my tens digit, and my tens digit is twice my units digit. The sum of all my digits is 14. What number am I?
842
Let the units digit be x. The tens digit is 2x, and the hundreds digit is 4x. Summing them gives x + 2x + 4x = 7x = 14, so x = 2. The units digit is 2, tens digit is 4, and hundreds digit is 8.
About this riddle
Logic riddles give you a few facts and ask what must be true. List what you know, cross out what cannot be, and see what is left.
Difficulty: Medium. More like this: Logic riddles with answers or try Einstein's Logic Grid for a different kind of puzzle.
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