Tom's mathematics test had 60 questions: 10 arithmetic questions, 30 algebra questions and 20 geometry questions. Although he correctly answered 70% of the arithmetic questions, 40% of the algebra questions and 50% of the geometry questions, he did not pass the test because he got fewer than 60% of the questions right. How many more questions would he have needed to answer correctly to earn a passing grade of 60%?

Guest Jul 12, 2021