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 1157719: 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 ikleyn(52832) About Me  (Show Source):
You can put this solution on YOUR website!
.

The answer is  5%2A%2836%2F%287%2B5%29%29 = 5%2A%2836%2F12%29 = 5*3 = 15 failed.

This simple problem deserves to be solved in one line.