Question 485284

In a 4-digit number 
<pre>
So make 4 blanks for the digits:

_ _ _ _

</pre>
the tens and hundreds digits are 3. 
<pre>
So fill in 3's for the tens and hundreds digits, the 
middle two digits:

_ 3 3 _ 

</pre>

The ones digit is twice the tens digit. 
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The tens digit is 3, and twice 3 is 6, so put 6 for the 
ones digit:


_ 3 3 6

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The thousand digit is the sum of the ones digit and the hundreds digit. 
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The ones digit is 6 and the hundreds digit is 3, and 6+3=9, so
put 9 for the thousands digit.

Answer:

9 3 3 6

Edwin</pre>