sheila mixed 3 ounces of blue paint with 2 ounces of yellow paint. she decided to create 20 ounces of yellow paint does sheila need for the new mixture.

15ounces

Step-by-step explanation:

it's equivalent, so we can say that its equal.

let's call the denominator x and the numerador is 18 less then denominator, x - 18.

multiply

2.x = 5.(x - 18)

2x = 5x - 90

90 = 5x - 2x

90 = 3x

x = 90/3

x = 30

so: