SOLUTION: I don't get this. Shouldn't she just make the mixture using the 60% solution? Here's the problem: Susan Staples, a pharmacist, has a 60% solution of the drug sodium iodite. She al

Question 35083This question is from textbook
: I don't get this. Shouldn't she just make the mixture using the 60% solution?
Here's the problem: Susan Staples, a pharmacist, has a 60% solution of the drug sodium iodite. She also has a 25% solution of the same drug. She gets a prescription calling for a 40% solution of the drug. How much of each solution should she mix to make 0.5 liter of the 40% solution? This question is from textbook

Answer by stanbon(75887) (Show Source): You can put this solution on YOUR website!
Here's the problem: Susan Staples, a pharmacist, has a 60% solution of the drug sodium iodite. She also has a 25% solution of the same drug. She gets a prescription calling for a 40% solution of the drug. How much of each solutionshould she mix to make 0.5 liter of the 40% solution?
Let amount of 60% solution be "x" liters
Then amount of 25% solution must be "0.5-x" liters
Amount of sodium iodite in the 60% batch is 0.60x liters
Amount of sodium iodite in the 25% batch is 0.25(0.5-x)=0.125-0.25x liters
EQUATION:
sodium iodite + sodium iodite = 0.40(0.5 liters)
0.60x + 0.125-0.25x = 0.20 liters
Multiply thru by 1000 to get:
600x +125 - 250x = 200
350x=75
x=0.214 liters (amount of 60% solution)
0.5-x= 0.5-0.214= 0.286 liters (amount of 25% solution)
Cheers,
stan H.
RELATED QUESTIONS
Ok so I was doing a problem where I needed to subtract 120*tan(40) - 60*tan(40) So I (answered by ikleyn,MathTherapy,greenestamps)

Please help with this problem< i am terrible at math an i just don"t get it?? I even... (answered by stanbon)

I don't get this. Is there a solution? Here is the question: Daniel has 30 coins. He only (answered by Alan3354)

x= P(x) = 0 0.68 1 0.2 2 0.06 3 (answered by Boreal,math_tutor2020)

It�s been awhile since I have had Algebra. I looking at an equation that I just don�t... (answered by math_helper,ikleyn,josgarithmetic,greenestamps,Shin123)

Hi its me again, I already ask this question last time but I still don't get it can you... (answered by josgarithmetic,math_tutor2020)

2493 ___ ___ ___ ___ 8008 I just don't get... (answered by CubeyThePenguin)

Can someone please help me with this proof using the 18 rules of inference? > is a... (answered by jim_thompson5910)

Here�s the problem: For a car renting for $15 per day plus $.10 per mile, the cost for (answered by stanbon)