A pie is made up of crust, apples, and sugar, and the rest is jelly. What is the ratio of crust to jelly?

A TV show lasts 30 minutes, what fraction of the show is left after 12 minutes have passed?

In a solution, of the fluid is water, is wine, and is lemon juice. What is the ratio of lemon juice to water?

A bag contains red, orange, and yellow marbles only. The marbles occur in a ratio of 5 red marbles: 4 orange marbles: 1 yellow marble. If one-third of the red marbles, one-half of the orange marbles, and one-fourth of the yellow marbles are removed, then what fraction of the remaining marbles in the bag is red?

Marty drove 40 mi/hr for 3 hours, then 60 mi/hr for 1 hour, and finally 70 mi/hr for the last 2 hours. What was Marty's average speed?

If and , what is the ratio of to ?