To make a shade of lavender paint, jon mixes 4 oz of red tint and 28 oz of blue tint into one gallon of white paint. if 20 gallons of white paint and 80 oz of red tint are used, hiw much blue tint should be added? write a rule that you can use to find the amount of blue tint needed.

Jon will need to add 560 ounces of blue tint.

To find the correct amount, we should write and solve a proportion each time.
On the left side of the proportion, we will write our known rate (4 Red / 28 Blue).

On the right side of the proportion, we will write the amounts we are looking for.

We can write and solve the following equation.

4 Red / 20 Blue = 80 Oz Red / ? Oz Blue

If you cross multiply and divide the proportion, you will need 560 ounces of blue tint.