I am the number _ _ _ _

So my tens digit is a multiple of 3

So my tens digit is a multiple of 3 large enough to subtract 7 from.
Therefore my tens digit is 9.  So 
I am the number _ _ 9 _


>>My units digit is also seven less than my tens digit<<

Therefore my units digit is 9-7 or 2.  So 
I am the number _ _ 9 2


>>My tens digit is three times my hundreds digit.<<

Therefore my hundreds digit is 3.   
I am the number _ 3 9 2


>>my units digit is twice my thousands digit.<<

So my thousands digit is 1.            
I am the number 1 3 9 2


>>My units digit is...only one less than my hundreds digit<<

We don't need that information, but it checks 
since 2 is 1 less than 3.
I am the number 1392.

Edwin
 

 

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