Answer: There were 99 more skateboarders than skaters at the park on Saturday.
Step-by-step explanation:
Let there were 8x skaters and 3x skateboarders on Friday.
There were 168 skaters on Friday.
So, [tex]8x=168[/tex]
[tex]\Rightarrow\ x=\dfrac{168}{8}=21[/tex]
3x = 3 (21)=63
Total skaters and skateboarders on Friday = 168+63 = Â 231
Also, the  ratio of the number of skaters to the number of skateboarders was 2:5
Let there were 2x skaters and 5x skateboarders on Saturday.
Then,
[tex]2x+5x= 231\\\\\Rightarrow\ 7x = 231\\\\\Rightarrow\ x=\dfrac{231}{7}[/tex]
[tex]\Rightarrow\ x=33[/tex]
Number of skaters = 2(33) = 66
Number of skateboarders = 5(33) = 165
Difference = 165-66= 99
Hence, there were 99 more skateboarders than skaters at the park on Saturday.