The total number of students that went to the physics lab is what percentage of the total number of students in the college?
The total number of girl students is what percentage of the total number of staff members in the school?
What is the ratio of the total number of students in College S in the year 2006 and 2009 together to the total number of students in College U from the same years?
The number of girls in school A is approximately what percentage of the total number of students in school B?