A dehydrated patient needs a 3.6% saline IV. Unfortunately, the hospital only has bags of 2% and 4% saline solutions. How many liters of each of these solutions should be mixed together to yield 1 liter of the desired concentration?

Question

anonymous · Answer

$$.04x+.02(1-x)=.036$$ should do it

hero · Answer

Whatever happened to using the beaker method?

hero · Answer

I showed it to you once

anonymous · Answer

that was wrong 
$$40x+20(1-x)=36$$ is what i meant

anonymous · Answer

my short term memory got shot off in the war

hero · Answer

lol, I guess

anonymous · Answer

not saying which war though...
@shesmketr  you got it from here?

anonymous · Answer

What he said...

anonymous · Answer

$$40x+20-20x=36$$
$$20x+20=36$$
$$20x=16$$
$$x=\frac{16}{20}=.8$$ so .8 of the 4% solution, .2 of the 2%

anonymous · Answer

and no 7% solution