# A chemist has one solution containing 30% insecticide and another solution containing 50% insecticide. How much of each solution should the chemist mix to get 200 L of a 42% insecticide?

##### 1 Answer

Apr 1, 2016

#### Answer:

He or she should use

#### Explanation:

Amount of substance = concentration x volume.

Let

Let

Because the total amount of insecticide does not change

we can set up 2 simultaneous equations:

From

Substitute this for

Substitute this back into