Something does decrease, because certain things that used to be done before usually remain undone.
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A variable means to decrease it's value by something%
You divide the original number by 10. A 10-fold decrease in something means that it was reduced by 10 times. So, a 10-fold decrease of 500 of something, means that it dropped to a quantity of 50.
The rate at which something got smaller or lesser.
It means reduction, subtraction, or when you are taking something away in math.
Directly proportional means that both variables increase or decrease at the same time.