Answered

If 15 is added to the sum of ?12 and ?3, then the result will be _____.

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Mlcparra16id
Sum is the result when two numbers are added. So:
[tex]15+(12+3)=15+15=30[/tex]

Therefore the result is 30
Eireneireneid
The answer is 30 
The sum of 12 and 3 is obviously 15
So if you add 15 to 15, the resulting number will be 30