SOLUTION: What quantity of a 75% acid solution must be mixed with a 40% solution to produce 300mL of a 50% solution?

Question 851934: What quantity of a 75% acid solution must be mixed with a 40% solution to produce 300mL of a 50% solution?
Answer by josgarithmetic(39618) (Show Source): You can put this solution on YOUR website!
If the percents are weight per weight, then the densities or specific gravities of the two solutions to be mixed are needed. Why do students have to answer questions like this one?

If the percents are as volume per volume, then:
u = how much of 40%
v = how much of 75%

and
Solve this system for u and v.

And then using the volume sum equation, a substitution,

ml.
Again using the volume sum equation,
RELATED QUESTIONS
What quantity of 60% acid solution must be mixed with 30% acid solution to produce 300mL... (answered by Earlsdon)

What quantity of 60% acid solution must be mixed with 30% solution to produce 300mL of a... (answered by venugopalramana)

What quantity of 60% acid solution must be mixed with 30% solution to produce 300mL of a... (answered by Nate)

what quantity of x of 65% acid solution must be mixed with a 20% solution to produce... (answered by Fombitz)

What quantity of a 60% acid solution must be mixed with a 30% solution to produce 300mL... (answered by checkley77)

What quantity of a 60 percent acid solution must be mixed with a 30 percent solution to... (answered by richwmiller)

What quantity x of a 65% acid solution must be mixed with a 20% solution to produce 300mL (answered by edjones)

what quantity of pure acid must be added to 300mL of a 50% acid solution to produce a 60% (answered by ikleyn)

what quantity of 80% acid solution must be mixed with a 20% solution to produce 840mL of... (answered by Alan3354)