Wouldn't it be 20/46?
Since 20+10+9+7= 46 which is the total of students.
And since you are trying to find what percentage of them are 9th graders it's 20.
So 20/46= 0.43 which is 43%
So the answer is 43% of the students on the buss are 9th graders.
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MONDAY December 3, 2012 SCHOOL SUBJECTS Art Business Computers English Foreign Languages Health Home Economics Math Music Physical Education Science Social Studies GRADE LEVELS Preschool Kindergarten Elementary School 1st Grade