Answer:
The total points by Washington High School =  162 points
The total points by  Johnson High School   =  159 points
The total points by  Roosevelt High School =  108 points
The total points by  Lewis High School =  196 points
Washington High School  has WON the meet.
Johnson High School came second.
The difference in the points= 2 points
Step-by-step explanation:
Points awarded for first place = 10 points
Points awarded for second place = 8 points
Points awarded for third place = 7 points
About Washington High School 
10 first places  = 10 x ( 10) = 100 points
6 second places  = 6 x ( 8) = 48 points
2 first places  = 2 x ( 7) = 14 points
So, the total points by  Washington High School  = Sum of all points  
 =  100 + 48 + 14   =  162 points     .............. (1)
About Johnson High School
8 first places  = 8 x ( 10) = 80 points
9 second places  = 9 x ( 8) = 72 points
1 first places  = 1 x ( 7) = 7 points
So, the total points by  Johnson High School  = Sum of all points  
 =  80 + 72 + 7   =  159 points    .............. (2)
About Roosevelt High School
4 first places  = 4 x ( 10) = 40 points
5 second places  = 5 x ( 8) = 40 points
4 first places  = 4 x ( 7) = 28 points
So, the total points by  Roosevelt High School  = Sum of all points  
 =  40 + 40 + 28   =  108 points  .............. (3)
About Lewis High School
3 first places  = 3 x ( 10) = 30 points
3 second places  = 3 x ( 8) = 24 points
6 first places  = 6 x ( 7) = 42 points
So, the total points by  Lewis High School  = Sum of all points  
 =  30 + 42 + 24   =  96 points      .............. (4)
Now, comparing all four equation, we get that:
Washington High School  has WON the meet.
Johnson High School came second.
The difference in the points  = 162 - 159 = 2 points