Question

.Yuri makes his own citrus vinaigrette salad dressing. He likes the dressing best if it contains 20% fruit juice. He has a bottle of dressing mixture that contains 50% juice and 3 cups of dressing that contains 10% juice. How much of the dressing mix with 50% juice should Yuri add to the dressing mix with 10% juice to get the dressing he prefers with 20% juice? Show your work.