In a local school district, the high school and middle school each received r dollars toward funding for the student arts program. The high school enrolled 500 students and the middle school enrolled 250 students. Later, the middle school transferred s dollars to the high school so that they would have received the same funding per student. Which of the following is equivalent to s? Choose the correct choice from the following answers.
A) r/8 B) r/7 C) r/2 D) r/9 E) r/3
Total per head = 2r/750   After s transfer both schools have total for head.   So at High School it will be:   r+s = (500)* (2r/750) = 20r/15=4r/3   i.e. s = 4r/3 - r/1 =4r-3r/3=r/3   Answer :r/3
<result>E</result>
In a local school district, the high school and middle school each received r dollars toward funding for the student arts program. The high school enrolled 500 students and the middle school enrolled 250 students. Later, the middle school transferred s dollars to the high school so that they would have received the same funding per student. Which of the following is equivalent to s?