Board Thread:Off-Topic Posts/@comment-32576568-20190405202604/@comment-28278669-20190425194609

1, -1, square root of 7, and negative square root of 7

In a class of p students, the average (arithmetic mean) of the test scores is 65.

In another class of n students, the average of the scores for the same test is 80.

When the scores of the two classes are combined, the average of the test scores is 75.

What is the value of p/n?