Spelled out in standard English words, which positive integer has all of its letters in strictly alphabetical order?
Forty
The letters in 'FORTY' appear in alphabetical sequence: F (6), O (15), R (18), T (20), Y (25). It is the only number in the English language with this property.
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: Easy. More like this: Math riddles with answers or try Target 24 for a different kind of puzzle.
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