The sum of twenty-five and fifteen = 25 + 15 = 40
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Their sum must be 60.
The sum of the first 15 odd numbers is 225.
75
The sum of 15 and -7 is 8.
For the product to be zero, one of the numbers must be 0. So the question is to find the maximum sum for fifteen consecutive whole numbers, INCLUDING 0. This is clearly achived by the numbers 0 to 14 (inclusive), whose sum is 105.