Final answer:
To find out how many games the 2015 team won, subtract 2 from the 2016 team's wins.
Step-by-step explanation:
To find out how many games the 2015 team won, we can use the given information about the 2016 and 2017 teams. We know that the 2017 team won 20 games and 2 more than the 2016 team. So, if we subtract 2 from the 2017 team's wins, we get the number of wins for the 2016 team, which is 18. Now, since the Fighting Hens' record has improved every year, we can assume that the 2015 team's wins are 2 less than the 2016 team's wins. Therefore, the 2015 team won 16 games.
To solve the problem, let's determine how many games the Fighting Hens won each year. The problem already mentions that the team won 20 games in 2017 and that was 2 more games than in 2016. So, the team must have won 20 - 2 = 18 games in 2016. Now, since the team's record has improved every year, the number of games won in 2015 must be less than the number of games won in 2016. Hence, the team won 18 - 1 = 17 games in 2015 because the improvement is by at least 1 game each successive year.