A baseball pitcher has pitched a total of 25 innings so far during the season and has allowed 18 runs. At this rate, how many runs, to the nearest hundredth, would he allow in nine innings? This number is called the pitcher’s earned run average, or ERA.

Question

b. Randy Johnson of the Arizona Diamondbacks had an ERA of 2.64 in 2000. At that rate, how many runs would he be expected to allow in 100 innings pitched? Round your answer to the nearest whole number.

Answer 1

A. 18/25 = x/9

B. x/100 = 2.64/9

Solve for x.