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17 November, 14:15

A scientist wants to create 120 ml of a solution that is 30% acidic. To create this solution, she has access to a 20% solution and a 45% solution. How many millimeters of each solution should she combine to create the 30% solution? Solve this problem using a system of two equations in two variables.

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  1. 17 November, 14:26
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    The solution for this problem is:

    First, you need to multiply the solution to the 30 percent

    120 x. 3 = 36

    m + n = 125

    2m + 45n = 36

    2m + 2n = 240

    3n = 120

    n = 40

    m = 80

    Therefore, you need 80 ml of 20% solution and 40 ml of 45% solution to make 120 ml solution of 30% solution.
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