To find out how much yellow paint Nate needs to buy, we first need to understand the ratio of blue to yellow paint, which is 1:3. This means for every 1 part of blue, there are 3 parts of yellow.
The total parts in the ratio are: 1 (blue) + 3 (yellow) = 4 parts.
Since Nate needs a total of 8 gallons of paint, we can determine how much each part represents by dividing the total amount of paint by the total number of parts: 8 gallons ÷ 4 parts = 2 gallons per part.
Now, to calculate the amount of yellow paint: Yellow paint = 3 parts × 2 gallons per part = 6 gallons.
Therefore, Nate needs to buy 6 gallons of yellow paint.