You mix 3/5 quart of blue paint for every 1/3 quart of red paint to make 5 3/5 quarts of purple paint. How much blue paint and how much red paint do you use?
3/5 + 1/3 = 14/15
5 3/5 รท 14/15 = 6
so
blue:red = 3/5 : 1/3 = 18/5 : 2
5 3/5 รท 14/15 = 6
so
blue:red = 3/5 : 1/3 = 18/5 : 2