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19 February, 16:02

Maria is setting up a 20gal salt water fish tank. That needs to have a salt content of 3.5%. if she has water with 2.5% salt and water with 3.7% salt. How many gallons of water with 3.7% salt content must she use?

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  1. 19 February, 16:04
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    X + y = 20 - - - > x = 20 - y

    2.5x + 3.7y = (3.5) (20) = 70

    --> 2.5 (20-y) + 3.7y = 70

    --> 50 - 2.5y + 3.7y = 70

    --> 1.2y = 20

    ---> y = 16.66

    Answer: 16.66 gallons
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