选择题
1999 AMC 8 Problem 16: Passing Score Needed
Tori's mathematics test had 75 problems: 10 arithmetic, 30 algebra, and 35 geometry. She answered 70% of the arithmetic, 40% of the algebra, and 60% of the geometry problems correctly. She did not pass because she got less than 60% of all the problems right. How many more problems would she have needed to answer correctly to earn a 60% passing grade?
A.
1
B.
5
C.
7
D.
9
E.
11