Greg is painting the doors at his school. He can paint 4/5 of a door in 1/2 hour. What is Greg's rate of painting doors in terms of doors per hour? Destiny paints 3/4 of her room with 1/3 can of paint. At this rate, what fraction of the can of paint will Destiny need to paint her entire room?

A 34-ounce bottle of apple juice contains 2 1 /2 grams of sugar. The Apple juice has grams of sugar per ounce.