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2015-05-13T20:05:45+08:00

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

Therefore the result is 30
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2015-05-14T10:31:30+08:00

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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
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