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charlie has 80 ml of a 15% acid solution how much of a 20% acid slolution must be added to create a solution that is 18% acid.

  • algebra -

    Let x be the number of ml that must be added. The amount of acid contained in the mix can be written two ways, and is:

    0.15*80 + 0.20x = 0.18*(80 + x)
    Solve for x

    12 + 0.20x = 14.4 + 0.18x
    0.02x = 2.4
    x = 120 ml

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