To find out how much yellow paint Nate needs to buy, we can start by determining the total parts in the ratio of blue to yellow, which is 1:3.
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Calculate the total parts: \[ 1 \text{ (blue)} + 3 \text{ (yellow)} = 4 \text{ (total parts)} \]
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Determine the amount of paint per part: If Nate needs 8 gallons of paint total, each part of the ratio represents: \[ \frac{8 \text{ gallons}}{4 \text{ parts}} = 2 \text{ gallons per part} \]
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Calculate the amount of yellow paint: Since yellow paint is 3 parts, the total amount of yellow paint needed is: \[ 3 \text{ parts} \times 2 \text{ gallons per part} = 6 \text{ gallons} \]
Thus, Nate needs to buy 6 gallons of yellow paint.