A chemist needs 30 liters of 20% acid solution. She has containers of 10% solution and 25% solution.

She begins to make a table:

Acidity
Amount of sol.
(liters)
Amount of acid
(liters)

Sol. 1 10% * $\displaystyle{x}\usepackage{cmbright}\Huge\$ =

Sol. 2 25% * $\displaystyle{30}-{x}\usepackage{cmbright}\Huge\$ =

Mix 20% * 30 =

How many liters of each should she combine to get the needed solution?

	Acidity		Amount of sol. (liters)		Amount of acid (liters)
Sol. 1	10%	*	$\displaystyle{x}\usepackage{cmbright}\Huge\$	=
Sol. 2	25%	*	$\displaystyle{30}-{x}\usepackage{cmbright}\Huge\$	=
Mix	20%	*	30	=