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27 June, 16:22

Marco is draining his two aquariums. The tanks are the same size. One tank has 7 in. of water in it and is being drained at a rate of 1 in./min. The other tank has 5 in. of water in it and is being drained at a rate of 0.5 in./min. After how many minutes will the tanks contain the same amount of water?

Remember to enter a numerical answer.

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  1. 27 June, 18:42
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    Let x be the number of minutes it takes for the two tanks to contain the same amount of water, then

    7 - x = 5 - 0.5x

    -0.5x + x = 7 - 5

    0.5x = 2

    x = 2/0.5

    x = 4 mins

    Therefore, the tanks will contain the same amount of water after 4 mins.
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