Math Problem?

Yurosha likes to make grapple juice, g juice and apple juice combined. She starts with a pitcher containing 45 ounces of grapple juice that is 20 percent g and 80 percent apple. After trying some of it, she decides that it contains too much apple, so she adds 15 ounces of g juice and mixes it together. For the family dinner, she pours the juice from the contents of the whole pitcher into four large gles, having the same portion in each. Yurosha’s mother prefers grapple juice that is 25 percent g and 75 percent apple. How many ounces of apple juice must she add to her gl to make her juice tast the way she likes?