SOLUTION: In Chemistry Class, you mixed a 3% saline solution and a 25% saline solution that resulted in 50 ml of 20% saline solution. How much of the 3% saline solution did you use?

Question 1007657: In Chemistry Class, you mixed a 3% saline solution and a 25% saline solution that resulted in 50 ml of 20% saline solution.
How much of the 3% saline solution did you use?

Answer by fractalier(6550) (Show Source): You can put this solution on YOUR website!
Let x be the amount of 3% solution.
Thus 50-x is the amount of 25% solution.
The set up looks like this:
.03x + .25(50-x) = .20(50)
.03x + 12.5 - .25x = 10
-.22x = -2.5
x = 2.5/.22 = 11.36 ml of 3% solution
RELATED QUESTIONS
How much of a saline solution that is 20% saline should be mixed with 200 ounces of a... (answered by ikleyn,greenestamps)

How much of a saline solution that is 20% saline should be mixed with 200 ounces of a... (answered by stanbon,ikleyn)

In a chemistry class, 24 gallons of a 12% saline solution must be mixed with a 20% saline (answered by josgarithmetic)

How many ml of an 8% saline solution and a 3% saline solution should be mixed to produce... (answered by josgarithmetic)

A pharmacist mixed some 10%-saline solution with some 15%-saline solution to obtain 100... (answered by venugopalramana)

A pharmacist mixed some 10%-saline solution with some 15%-saline solution to obtain 100... (answered by rwm)

A pharmacist mixed some 10%-saline solution with some 15%-saline solution to obtain 100... (answered by josmiceli)

How many ML of a 25% saline solution should be added to 30 mL of a 5% saline solution to... (answered by josgarithmetic)

You obtain 15 grams of a 5% saline solution from a mixture of a 3% saline solution and an (answered by richwmiller)