A TERRORIST TOOK OVER A PLANE HE DEMANDED MONEY AND RIDDLES WITH ANSWERS TO SOLVE - PUZZLES & BRAIN TEASERS

Nowhere, because the survivors are alive. Did you answer this riddle correctly?
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Nep-tunes! Did you answer this riddle correctly?
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When there's change in the weather! Did you answer this riddle correctly?
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In a snow bank! Did you answer this riddle correctly?
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Because they're always a little short! Did you answer this riddle correctly?
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In a river-bank! Did you answer this riddle correctly?
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Mercury Did you answer this riddle correctly?
YES  NO  

$40 (10 at $4, or 8 at $5). Did you answer this riddle correctly?
YES  NO  

Mercury Did you answer this riddle correctly?
YES  NO  

Earth Did you answer this riddle correctly?
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This one is best solved working backwards, the last part David spent half of what was left plus $1.00 on candy and then was out of money. That means he must have spent $2.00 on Candy as $1.00 was half of what he had using the same logic backwards: $2.00 on candy $6.00 on Balloons and Streamers $12.00 on the cake Total of $20.00. Did you answer this riddle correctly?
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Saturn Did you answer this riddle correctly?
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Saturn Did you answer this riddle correctly?
YES  NO  

Saturn Did you answer this riddle correctly?
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Mars Did you answer this riddle correctly?
YES  NO