The problem would be easier to solve if you would break it up into capitalized sentences. What you have written is a run-on sentence that is difficult to follow.
You should have written:
The number uses every number 0-9.
Each number is used only once.
The fourth digit is 4.
The first digit in the billions place is 3.
The 5 is the next-to-the-last digit.
The sixth digit is 7.
The digit after 3 is 9.
The digit before 5 is 2.
The third digit is half the value of the eigth digit.
The last digit is twice the amount of the fourth digit.
A 0 precedes the 7.
The seventh digit is the sum of the 1st and 4th digits.
Fill in the blanks, step by step, according to the directions above.
You finish it
The sixth digit is 7 not 6
It wouldn't let me break down the way you have it. it all looks like what I put other than the 6 should be a 7, if I understand right.
Correct. The sixth digit is 7.
My mistake. Anyway, you get the idea.
If that is the way the question was written, you should be learning math, and grammar, somewhere else.
The only digit left to fill the blank is 6.
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