Anita's mathematics test had 75 problems, i.e., 10 arithmetic, 30 algebra and 35 geometry problems. Although she answered 70% of the arithmetic, 40% of the algebra and 60% of the geometry problems correctly, she did not pass the test because she got less than 60% of the problems right. The number of more questions she would have needed to answer correctly to earn a 60% passing grade is-