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You need a 45% alcohol solution. On hand, you have a 150 mL of a 15% alcohol mixture. You also have 70% alcohol mixture. How much of the 70% mixture will you need to add to obtain the desired solution?

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  1. add up the amount of alcohol in each part. It must equal the alcohol in the final mixture:

    .15*150 + .70x = .45(150+x)

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  2. 368

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