Sheila mixed 3 ounces of blue paint with 2 yellow She decided to create 20 the same mixture How many does need for new mixture?

Let's think step-by-step.

The ounces for the new mixture can be calculated using the ratio of ounces for blue and yellow paints in the original mixture.

Multiply the amount of blue paint needed for 20 mixtures by the ratio of blue paint to yellow paint in the original mixture.

Multiply 20 by 3/5.

20 * 3/5 = 12 ounces of blue paint.

The final answer is 12 ounces.