7/60 = 0.11(6), so 7 is about 12% of 60. You would have an 88% on that test.
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549/10 = x/6010x=540x=54
22 questions can be wrong. This means that you would have to get 33 marks, which is 60%
You need to get 40*60/100 = 24 correct, so you can get 40-24 = 16 wrong.
Your score would be 91.7% . Your letter-grade would be whatever the teacher decided to award for 91.7% . I'm just hoping it wasn't a math test.
If you answered 27 correctly and 18 incorrectly, you would have answered 60% correctly.