So basically there was a test with 72 questions and you got x number of them wrong, and got 70%.
So... You have to find out what 70% of 72 is.
All you have to do is multiply 0.70 by 72. Which equals 50.4
50 represents the number of questions you got right out of 72.
So, 50/72 = roughly 70%
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72 - 50 = 22
SO. To answer you question, you can miss 22 questions out of 72 to get 70 percent.
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18
70% of 15 is 10.5 so it is 4.5 questions
No more than 19. You can do it!
Assuming that you get all your answers correct (can you rely on that?), you can miss 12.
14 miss 35 correct 35/49 = 0.714 = 71.4%