Yesterday I saw a man riding a bicycle with five large bags full of aluminum cans on the back and three big bags on the front. Why do people like him collect aluminum cans? Because aluminum cans are valuable. Aluminum is expensive to make from raw materials because it uses a lot of energy. Recycling aluminum only uses 5% of the energy used for making new aluminum. As a result, recyclers pay good money for aluminum cans. These days, they buy aluminum cans for about 120 yen per kilogram. Each empty can weighs about 15 grams, so you need about 70 cans to make 1 kilogram. I wonder how many cans this man can carry.  (115 words)