Let's call the number of football cards [tex]x[/tex]
Number of baseball cards = [tex]30 + 2x[/tex]
As the total number of cards is 360:
[tex]x + 2x + 30 = 360
3x = 360 - 30
3x = 330
x = 110[/tex]
So there are 110 football cards
And there are 110*2 + 30 = 220 + 30 = 250 baseball cards