At noon a tank contains 10 cm of water after several hours it contains 7 cm of water what is the percent decrease of water in the tank

30%.

Step-by-step explanation:

We have been given that at noon a tank contains 10 cm of water after several hours it contains 7 cm of water.

To find the decrease percent we will use formula:

Upon substituting our given values in above formula we will get,

Therefore, the percentage decrease of water in the tank is 30%.

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