What is the sum of 15 and 89?

What does it mean when someone asks you for the sum of 15 and 89? The sum is part of the addition equation displayed below.

addend + addend = sum

When someone asks "What is the sum of 15 and 89?" they mean that 15 is an addend and 89 is an addend in an addition equation.

Therefore, as you may have inferred, the sum of 15 and 89 is the same as 15 plus 89. Here is the addition equation with the answer:

15 + 89 = 104

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What is the sum of 15 and 90?
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