Question 461782
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I am the number _ _ _ _
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>>My tens digit is three times my hundreds digit.<<
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So my tens digit is a multiple of 3
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>>My units digit is also seven less than my tens digit<< 
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So my tens digit is a multiple of 3 large enough to subtract 7 from.
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Therefore my tens digit is 9.  So 
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I am the number _ _ <u>9</u> _
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>>My units digit is also seven less than my tens digit<<
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Therefore my units digit is 9-7 or 2.  So 
I am the number _ _ <u>9</u> <u>2</u>
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>>My tens digit is three times my hundreds digit.<<
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Therefore my hundreds digit is 3.   
I am the number _ <u>3</u> <u>9</u> <u>2</u>
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>>my units digit is twice my thousands digit.<<
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So my thousands digit is 1.            
I am the number <u>1</u> <u>3</u> <u>9</u> <u>2</u>
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>>My units digit is...only one less than my hundreds digit<<
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We don't need that information, but it checks 
since 2 is 1 less than 3.
I am the number 1392.

Edwin</pre>