# How much #90%# saline solution should we mix to #3qt.# of #15%# saline mix to make #45%# saline solution?

##### 2 Answers

#### Explanation:

Let

We can then express the problem mathematically as:

Then, let's substitute the first mathematical expression in place of

Therefore, we need to mix

We need

#### Explanation:

Let us assume that we need to mix

It is mixed with

and on mixing the two, the total quantum of saline is

This is

hence

or

or

or

i.e.

Hence, we need