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10 December, 19:50

Meryl needs to add enough water to 11 gallons of an 18% detergent solution to make a 12% detergent solution. Give the equation that she can use to find g, the number of gallons of water she should add?

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  1. 10 December, 19:55
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    The amount of detergent is:

    11 * 0.18 = 1.98 gallons

    The equation is:

    0.12 * (11 + g) = 1.98

    After that:

    1.32 + 0.12 g = 1.98

    0.12 g = 1.98 - 1.32

    0.12 g = 0.66

    g = 0.66 : 0.12

    g = 5.5 gallons of water
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