If, in a class of 42 learners, Student Perfect has 100% on his maths test and the class average of the test is 60%, approximately how much (in percent) would the average drop if he hadn't written the test?
Excel in math and science
Master concepts by solving fun, challenging problems.
It’s hard to learn from lectures and videos
Learn more effectively through short, conceptual quizzes.
Our wiki is made for math and science
Master advanced concepts through explanations,
examples, and problems from the community.
Used and loved by 4 million people
Learn from a vibrant community of students and enthusiasts,
including olympiad champions, researchers, and professionals.
Your answer seems reasonable.
Find out if you're right!