安德鲁‘s mathematics test had 75 problems: 10 arithmetic, 30 algebra, and 35 geometry problems. Although he answered 70% of the arithmetic, 40% of the algebra, and 60% of the geometry problems correctly, he did not pass the test because he got less than 60% of the problems right. How many more problems would 安德鲁 have needed to answer correctly to earn a 60% passing grade?
- A: 1
- B: 5
- C: 7
- D: 9
- E: 11
0
voters