WHAT IS IN THE DECEMBER THAT MAKES IT UNIQ RIDDLES WITH ANSWERS TO SOLVE - PUZZLES & BRAIN TEASERS

Yes it is possible in Roman Numerals. In Roman Numerals,
9 = IX
10 = X
11 = XI

Thus by removing one from 9, you are getting 10 and by removing one from 11, you are getting 10 again. Did you answer this riddle correctly?
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He lived in a lighthouse as lighthouse keeper. He turned off all the lights by accident, so a ship with 7 passengers couldnt negotiate the rocky shores. One would think the light switches in a lighthouse would be more clearly marked. Did you answer this riddle correctly?
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Fake/ counterfeit money Did you answer this riddle correctly?
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Love Did you answer this riddle correctly?
YES  NO  

A cauldron Did you answer this riddle correctly?
YES  NO  

Snow Did you answer this riddle correctly?
YES  NO  

Counterfeit Money Did you answer this riddle correctly?
YES  NO  

Sandpaper Did you answer this riddle correctly?
YES  NO  

It contains all of the letters in the alphabet. Did you answer this riddle correctly?
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Cauldron Did you answer this riddle correctly?
YES  NO  

Lemon! Did you answer this riddle correctly?
YES  NO  

Barty Crouch Jr Did you answer this riddle correctly?
YES  NO  

The Baa-hamas! Did you answer this riddle correctly?
YES  NO  

Mistletoe Did you answer this riddle correctly?
YES  NO  

John Albert "L.A." Burr Did you answer this riddle correctly?
YES  NO