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A provider orders 90 ml of a 2.5% mannitol solution. How much of a 25% mannitol solution should be added to water to achieve the appropriate strength?

  • MATH -

    the amount of mannitol remains constant as water is added, so if x ml of 25% solution are used,

    .25x = .025*90
    x = 9

    makes sense that 1/10 as much is used, since it's 10 times as strong.

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