Ms. Burger has graded 45 tests. This represents 60% of her 3 math classes. How many math students does Ms. Burger teach?
We assume that the
So, we have the equation:
#0.60s = 45#
That means the total number of students (not distinguishing between the number of students per class) is:
#color(blue)(s) = 45/0.60 = color(blue)(75)#
(we divided both sides by
NOTE: A common mistake is to write:
#s = 0.60xx45#,
which is backwards. It would say that there were more tests given out than students who took the test. Make sure your answer makes physical sense.