Red and white paint are mixed to make pink paint. If the amount of red paint needed is half the amount of white paint, how many gallons of red paint are needed to make 10 gallons of pink paint?

We will need about 3.3 gallons of red paint.

Step-by-step explanation:

Let

r = amount of red paint w = amount of white paint

The amount of red paint is half the amount of white paint.

r = 1/2 w

w = 2r [1]

We need to make a total of 10 gallons. Then,

r + w = 10 [2]

Replacing [1] in [2]

r + (2r) = 10

3r = 10

r = 3.3

We will need about 3.3 gallons of red paint.