To make 1 cup of pink icing add 4 drops of red coloring to 1 cup of white icing. how much of each ingredient do you need to make 6 cups of icing that is the same shade of pink

Savannah is painting a striped background for a mural on a wall that is 1515 yards long. she wants a total of 9696 stripes that are all the same width. which calculation should savannah use to decide how wide to make each stripe?