To make a fruit punch the recipe says to mix 3 cups of grape juice with 1 1/2 cups of orange juice. what is the amount of grape juice needed for per each cup of orange juice?

This size running track is usually called a 400 meter track. however if a person ran as close to the inside as possible on the track they would run less than 400 meters in one lap. how far away from the inside border would someone have to run to make one lap equal exactly 400 meters