In a particular soccer league of 20 teams, each team plays a total of 38 games over the course of a season. Teams are awarded 3 points for a win, 1 point for a draw, and no point for a loss. Lucy's favorite team scored a total of 54 points this season and she is especially happy because the sum of games won or drawn this season exceeded twice the number of games lost by 8 games. Mark's favorite team won 2 games fewer and drew 5 games more than Lucy's favorite team this season.
- (a)
Find the number of games won by Lucy's favorite team this season.
- (b)
Explain, with clear workings, which team performed better this season.
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Worked solution
1(a)
1. Define variables and formulate the system of equations based on the given information.
Let , , and be the number of games won, drawn, and lost by Lucy's favorite team respectively.
From the total number of games:
From the total points:
From the relationship given:
2. Solve for the number of games lost ($L$) using substitution.
Substitute into the total games equation:
3. Solve for the number of games won ($W$).
Substitute into :
This gives .
Substitute into the points equation :
13
1(b)
1. Calculate the total points scored by Mark's team by evaluating the difference in wins and draws.
Since a win awards points and a draw awards point, the difference in points for Mark's team relative to Lucy's team is:
2. Compare the points to determine the better performing team.
Lucy's team scored points, whereas Mark's team scored points.
Since , Lucy's team performed better.
Lucy's team performed better, as they scored 54 points compared to Mark's team's 53 points.
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