How many questions were in the test?

　　George took a test of a certain number of questions, each question having the same value. He answered 10 questions incorrectly. This resulted in an accuracy

　　George took a test of a certain number of questions, each question having the same value. He answered 10 questions incorrectly. This resulted in an accuracy score of 60%. How many questions were in the test?

　　A.15

　　B.20

　　C.25

　　D.30

　　E.35

答案：25，这是一道计算题，George的正确率是60%，错误率就是40%，我们用10除以40%，就可以得到总题数。