To get 90% you have to get 13 and 1/2 questions right.
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toget 80% you need .8 x 15 = 12 questions right. That means you can 15-12 = 3 questions wrong
The test has 25 questions and you can only get 5 questions wrong, if not you fail.You only need to get 15 questions right to pass.
70% of 15 is 10.5 so it is 4.5 questions
To get the answer you divide 216 by 15 which would get you 14.4. To make sure your answer is right multiply 15 by 14.4 which will get you 216. Its all connected!
There's no answer if no total points.