- Steel cans are made of steels
- Steel is always magnetic
- Therefore, steel cans are magnetic

- Aluminum cans are made of aluminums
- Aluminum is always nonmagnetic
- Hence, aluminum cans are nonmagnetic

- Steel cans are magnetic
- Aluminum cans are nonmagnetic
- Hence, a mixture of steel cans and aluminum cans is an example of a mixture of magetic and nonmagnetic material

- A mixture of steel cans and aluminum cans is an example of a mixture of magetic and nonmagnetic material
- Magnet can be used for separating a magnetic material from a mixture of a magnetic and nonmagnetic material
- Therefore, a magnet can be used to separate steel cans and aluminum cans

Hence, a magnet can be used to separate steel cans and aluminum cans
Question
Steel cans are separated from aluminum cans in a recycling center. Which of the following is the best way the recycling center can separate the steel cans from the aluminum cans?

Context
- Steel cans are made of steels 
- Magnet can be used for separating a magnetic material from a mixture of a magnetic and nonmagnetic material 
- Aluminum cans are made of aluminums 
- Steel is always magnetic 
- Aluminum is always nonmagnetic