Expressed as a formula, this would be equal to (x + 5)/15.
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The sum of twenty-five and fifteen = 25 + 15 = 40
the sum of the elements divided by the number of elements is the average
In any division sum, the number to be divided - the first number in a sum such as 6/2 = 3 is called the dividend. The second number is the divisor, and the answer is the quotient.
five times the sum of a number and 8 is -15.
The mean