Final answer:
The attendance at the music concert was 250 people and the attendance at the basketball game was approximately 833 people.
Step-by-step explanation:
To find out how many people attended the music concert, we need to determine the attendance at the basketball game first.
The attendance at the basketball game is 30% of the attendance at the concert, which means 0.30x = the attendance at the basketball game.
If the music concert was attended by 250 people, we can set up the equation as 0.30x = 250, where x represents the attendance at the basketball game.
To solve for x, we divide both sides of the equation by 0.30, and we get x = 250 / 0.30 = 833.33.
So, approximately 833 people attended the basketball game.
Therefore, 250 people attended the music concert.