Let's break down the ratio: 10:1:4 = base product:thinner:hardener To find the total parts, add the numbers: 10 + 1+ 4 = 15 Now, divide the total amount of paint (20.5 gallons) by the total parts: 20.5 + 15 = 1.367 (rounded to the nearest thousandth) Multiply this factor by each part to find the amount of each component needed: Base product: 10 x 1.367 = 13.670 gallons Thinner: 1 x 1.367 = 1.367 gallons Hardener: 4 x 1.367 = 5.468 gallons So, you need approximately 13.670 gallons of base product, 1.367 gallons of thinner, and 5.468 gallons of hardener. 6:51 AM