Answers to Brain Teasers

I hope you're not cheating! You better have at least TRIED to solve them!
 

Take the letters ERGRO. Put three letters in front of it, and the same three letters behind to form a common English word.
 
Answer: UND - UNDergroUND > Underground
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What number gives the same result when it is added to 1.5 as when it is multiplied by 1.5?
 
Answer: 3
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What do the following numbers have in common?
 
3    7    10    11    12
 
Answer: The only vowel they contain when they are written out fully, is the letter E
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Peter picked one pepper more than Paul. Pat picked one pepper more than Pam. Peter and Paul picked 10 more peppers than Pat and Pam. Peter, Paul, Pat and Pam picked 60 peppers. How many peppers did Peter pick?
 
Answer: 18 peppers
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What three letters can be placed in front of each of these words to form a new word?
 
Sport  Sword  Sage  Sable  Time
 
Answer: PAS - Passport, Password, Passage, Passable, Pastime
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