10 + 15 + 20 = 45
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your answer is 20 ( 10+5=15+5=20)
The answer can be negative, zero, or positive. For example: -15 + 20 + (-10) = -5 -15 + 20 + (-5) = 0 -15 + 20 + (-2) = 3
If I understand it correctly you want to know the answer to [(5 x 10)] / [10 + 15 - 20] which is 50/5 = 10
15/20 or 3/4
s = 20