A knitting machine used a total of 457{,}500457,500457, comma, 500 meters of yarn to make 100100100 cardigans and 200200200 pullovers yesterday. The machine takes the same length of yarn to make 212121 pullovers as to make 202020 cardigans. What length of yarn does the machine use to make cardigans and pullovers? The machine uses meters of yarn per cardigan and uses meters per pullover.