# Suppose you work in a lab and you need a 15% acid solution to conduct a certain test, but your supplier only ships a 10% solution and a 30% solution. You need 10 liters of the 15% acid solution?

##### 1 Answer

Oct 15, 2015

Let's work this out by saying the amount of 10% solution is

#### Explanation:

Then the 30% solution will be

The wanted 15% solution contains

The 10% solution will provide

And the 30% solution will provide

So:

You will need 7.5 L of the 10% solution and 2.5 L of the 30%.

**Note** :

You can do this another way. Between 10% and 30% is a difference of 20. You need to go up from 10% to 15%. This is a difference of 5.

So your mix should contain