So University A has a student to teacher ratio of 15:1.
University B has 3000 students to 150 teachers, which creates a student to teacher ratio of 20:1.
To boast the same student to teacher ratio as University A, University B would need to hire professors to lower their ratio.
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For example, if they hired 50 more professors so that they had 3000 students and 200 teachers, their ratio would become 15:1 just like University A.