Sum of all integers from 60 to 90 inclusive

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What is the sum of all integers from 60 to 90 inclusive?

The sum of inclusive integers is the Average of inclusive numbers × Count of Inclusive Numbers
Pushing the Average and Count button above, we get the following math:
The Inclusive Integer Average formula is below:
A =A + B
2

Plugging the numbers A = 60 and B = 90 into the formula, we get:
A =60 + 90
2

A =150
2

A = 75

The formula to count the number of integers is below:
Count = B - A + 1

Plugging the numbers A = 60 and B = 90 into the formula, we get:
90 - 60 + 1
Count = 31

Therefore, the sum of inclusive integers from 60 to 90 = 75 x 31 = 2325