15 + ? = 100 is the same as 100 - 15
So the answer is 85
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Well, honey, if you're looking for the missing number to make 15 add up to 100, the answer is 85. It's simple math, darling. Just subtract 15 from 100 and you get your missing piece. Now go out there and impress someone with your newfound arithmetic skills!
The number that when added to 15 equals 100 is 85. This can be determined by subtracting 15 from 100, which equals 85. Therefore, 15 plus 85 equals 100.