word problems

Question

In a university biology class, only 45% of the class passed their test.

If only 54 students passed the test, how many students are actually in the Biology class?

Answer 1

so 45% represents 54 students:

 

So that means that the ratio of the students who past to the total students is .45. Then:   passed / total = .45      implies    total = 54/.45 = 120.