...20
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-2 + 15 + 5 The indicated sum is 18 .
The sum of the first 5 numbers is 15. 1+2+3+4+5=15
The sum means the result of adding the numbers. Therefore the sum of 20 and 15 is 35. 5 times 35 is 175 - therefore 5 multiplied by the sum of 20 and 15 is 175.
(9 + 15)/(-5 + 1) = 24/-4 = -6.
15