Certain paint is to be mixed with 3 parts yellow to 2 parts blue. Twelve gallons of mixed paint are needed.

How many gallons of blue must be used?

4

4.8

7.2

10

Quantity of mixed paints that is needed to be made = 12 gallons

The ratio of yellow paint to blue paint that needs to be mixed = 3:2

The above information's are of immense importance in respect to getting to the answer of this question.

Let us assume the common ratio to be = x

Then

3x + 2x = 12

5x = 12

x = 12/5

= 2.40

Then

The quantity of blue pain that is required to be mixed = 3 * 2.4 gallons

= 7.2 gallons

From the above deduction we can easily conclude that the correct option among all the options given in the question is the third option.