Let the number you are looking for be x. Then 9 + x = 10 + 10. x is 11.
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'Sum' is pretty much a synonym for add, and 5+5 or 5 plus 5 is 10.
4 plus 10 plus 16 plus 70 equals 100. To find the sum of this series, simply add all the numbers together.
the sum of 10 + 10 = 20
The sum of 10 plus 8 is 18.
4 plus 10 = 14