The average SAT score for the college is 1060. Suppose the company's claim is correct and her score will increase by 10 points for each class that she attends. Write and solve an equation to determine the number of classes Sarah must take in order to earn the average score.

Answer 1

Let x be the number of classes Sarah must take.
According to the given information, her score will increase by 10 points for each class, so her score will be 1060 + 10x.
In order to earn the average score of 1060, her score must be equal to that: 1060 + 10x = 1060.
Subtracting 1060 from both sides, we get 10x = 0.
Dividing both sides by 10, we get x = 0.
Sarah must take 0 classes in order to earn the average score.