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A nurse mixes 70cc of a 60% saline solution with a 30% saline to produce a 36% saline solution. How much of the 30% solution he use?

 Feb 3, 2020
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Amount of saline of constituents = amount of saline in final solution

 

.60 (70)   +   .30 (x)     =   .36 ( x+70)

42               + .3x         =  .36x  + 25.2

16.8                           =      .06x

x = 280 cc of 30% solution

 Feb 3, 2020

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