Posted by **Niricoel** on Friday, July 6, 2012 at 10:29am.

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 -
**Steve**, Friday, July 6, 2012 at 12:44pm
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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