One student conserves 3 cups of water by turning off the tap while brushing teeth for 2 minutes. what is approximate around of water the student would conserve by this method in 7 trials

21 cups of water

Explanation:

If he saves 3 cups of water in one time that he turns off the tap while brushig his teeth, we just have to multiply those three minutes for the number of times he will be brushing his teeth, in the problem they tell us that the number of trials will be 7, so we just multiply it by 7:

So he will save 21 cups of water in 7 trials.

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