Question

At George Washington High School the ratio of graduating seniors that go on to college, as compared to those who do not, is 7 : 4. Last year 28 students went on to college. How large was the graduating class?

Answer 1

First you figure out that the ratio 7:4 is 1.75
Then you do this problem 28 divided by 1.75=16
And 28:16 is the same as 7:4 
Now all you do is add 28+16=44