360÷8÷3= 15 Parts that a machine tool can process in one hour.
1350/615 =18 hours. It takes 18 hours.
2、
600-440 =160g two glasses of water.
A glass of water 160 ÷ (5-3) = 80g.
I hope to learn by going up a flight of stairs. If you don't understand, you can ask questions and ask for adoption ~