I am a three-digit integer. My hundreds digit is three times my tens digit, and my units digit is 4 less than my hundreds digit. The sum of all three digits is 10. What number am I?
622
Let tens = T, hundreds = 3T, units = 3T - 4. Their sum is 3T + T + (3T - 4) = 7T - 4 = 10, yielding 7T = 14, so T = 2. Hundreds = 6, tens = 2, units = 2.
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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