$\"\"$

Margo has $\"\"$ milliliters of $\"\"$ solutions.

Find milliliters of $\"\"$ solutions should she add to obtain the required $\"\"$ solutions.

Find Amount of milliliters.

Let $\"\"$ is number of milliliters of $\"\"$ solutions to be added.

Make a table:

\ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \

Observe the table:

Amount of milliliter with $\"\"$ plus Amount of milliliter with $\"\"$ equals Amount of milliliter with $\"\"$ $\"\"$

$\"\"$

Solve equation.

$\"\"$ (Original equation)

$\"\"$ (Simplify)

$\"\"$ (Subtract $\"\"$ from each side)

$\"\"$ (Apply additive inverse property: $\"\"$ )

$\"\"$ (Subtract $\"\"$ from each side)

$\"\"$ (Apply additive inverse property: $\"\"$ )

$\"\"$ (Divide each side by $\"\"$ )

$\"\"$ (Cancel common terms)

Therefore, $\"\"$ of margo is added to obtain $\"\"$ solutions.

$\"\"$

$\"\"$ of margo is added to obtain $\"\"$ solutions.