What is the sum of the two consecutive integers 27 and 28?

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Multiple Choice

What is the sum of the two consecutive integers 27 and 28?

Explanation:
Two consecutive integers can be written as n and n+1, so their sum is (n) + (n+1) = 2n + 1. With n = 27, that becomes 2×27 + 1 = 54 + 1 = 55. You can also check by direct addition: 27 + 28 = 55. Another quick way is to note the average of the two numbers is 27.5, and twice that average is 55.

Two consecutive integers can be written as n and n+1, so their sum is (n) + (n+1) = 2n + 1. With n = 27, that becomes 2×27 + 1 = 54 + 1 = 55. You can also check by direct addition: 27 + 28 = 55. Another quick way is to note the average of the two numbers is 27.5, and twice that average is 55.

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