SOLUTION: In a certain class, the ratio of passing grades to failing grades is 7 to 5. How many of the 36 students failed the course?

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Question 1158019: In a certain class, the ratio of passing grades to failing grades is 7 to 5. How many of the 36 students failed the course?
Answer by Boreal(15235) About Me  (Show Source):
You can put this solution on YOUR website!
7:5 is a ratio for 12
36 is 3 x 12
21:15 is 3 times the 7:5 ratio
15 failed the class