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The first ten composite numbers are 4,6,8,9,10,12,14,15,16,18.

The total sum is 112. There is 10 Digits the we added, so the formula is going to be:

First Ten Composite Numbers / The Number of Digits We Added
112 / 10 = 11.2
So, my conclusion is that 11.2 is the answer
11.2 is my conclusion answer.. ^^