What is the sum of 9 and 20?

What does it mean when someone asks you for the sum of 9 and 20? The sum is part of the addition equation displayed below.

addend + addend = sum

When someone asks "What is the sum of 9 and 20?" they mean that 9 is an addend and 20 is an addend in an addition equation.

Therefore, as you may have inferred, the sum of 9 and 20 is the same as 9 plus 20. Here is the addition equation with the answer:

9 + 20 = 29

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What is the sum of 9 and 21?
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