The students in a science class spent 65% of the class period performing an experiment. how long is a class period if the time spent on this experiment was 52 minutes?

We let x be the length (in minutes) of a certain science class. 65% of this period is spent with the experiment which lasted for about 52 minutes. Mathematically, this can be expressed as,
                                    52 = (0.65)(x)
The value of x from the generated equation is 80. Thus, the science class is 80 minutes long.