Susie wants to have at least a 90 average for the year in her Algebra class. Her current test scores are 85, 100, 86, and 97. What does she need to score on her fifth test to have at least a 90 average?

Question

Susie wants to have at least a 90 average for the year in her Algebra class.  Her current test scores are 85, 100, 86, and 97.  What does she need to score on her fifth test to have at least a 90 average?

Ms. Sue · Answer

She has a total of 368 points now. She needs at least 450 points for a 90 average. How many more points does she need?