Answer: 17 friends
Explanation:
Let the number of people that will go to the game be represented by x.
Based on the information given, we can form an equation which will be:
15x + 2.25x + 1.75x = 350
19x = 350
x = 350/19
x = 18.4
That means 18 people can go to the games. Since Xavier is going, he will invite 17 friends more.