Algebra 1

Thank you in advance for your kind help!

How much fresh water should be mixed to a 30% salt water solution, to obtain 90 gallons of a 23% salt water solution?

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  1. you want to decrease the concentration by 23/30, so that means you have to increase the volume by 30/23.

    30/23 x = 90
    x = 90 * 23/30 = 69
    So, add 21 gallons of water

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