A pitcher's earned run average is the number of earned runs allowed per game of 9 innings. A pitcher allows 20 earned runs in 50 innings. What is the pitcher's earned run average?

Step-by-step explanation:

In baseball statistics, earned run average (ERA) is the average of earned runs given up by a pitcher per nine innings pitched (i.e. the traditional length of a game). It is determined by dividing the number of earned runs allowed by the number of innings pitched and multiplying by nine.