A group of juniors and seniors took a test. Exactly $\frac{3}{5}$ of the juniors and exactly $\frac{6}{7}$ of the seniors passed the test. I

A group of juniors and seniors took a test. Exactly of the juniors and exactly of the seniors passed the test. If the number of juniors who passed the test was of the number of seniors who passed the test, what fraction of the entire group passed the test? Express your answer as a common fraction.