+328 Melanie has a 4 gallon mixture of “homemade” orange paint mixed with red andyellow paint at a 3:7 ratio. However, the orange is a little bit too red to her liking,and she realized that she actually wanted a 2:13 ratio instead. Fortunately, she hasa lot of yellow paint. How many gallons of yellow paint should Melanie add to themixture to achieve the 2:13 ratio?
