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18 June, 20:38

As a water quality assurance employee for local Aqua America, Inc branch record a drop in water levels from 28 feet to 7 feet at your reservoir. What is your percentage decrease?

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  1. 18 June, 20:45
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    7 is 1/4 of 28, so 7 is 25% of 28.

    The drop from 28 to 7 is a drop of 21.

    21 is 3 times 7, so 21 is 3 times 25%.

    Answer: It is a 75% decrease.
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