How much 10% acid solution should be mixed with 1 L of 25% acid solution to produce a solution that is 15% acid?

Question

Not sure how to set up equation for this, Help!

Answer 1

Karlie, let a = the amount of 10% solution. You're going to need .10a, right?

 

You're adding it to .25(1) = .25.

 

Since you are adding the two amounts, you end up with .15(a + .25).

 

.10a + .25 =.15a + .0375

 

I bet you can get it from here!