125 - x, this is how i see it. you have 125 and it decreases by a number, since you dont know what that number is you put a variable to represent that number.
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125 - x.
When 25 is decreased by 20% the result 20.
its 5! 5x5=25 25x5=125 5x(5x5)=125
decreased
115.5.