2011 AMC 10B Problems/Problem 2
Problem 2
Josanna's test scores to date are and . Her goal is to raise here test average at least points with her next test. What is the minimum test score she would need to accomplish this goal?
Solution
The average of her current scores is . To raise it points, she needs an average of , and so after her tests, a sum of . Her current sum is , so she needs a .