15 out of 20 would be grade of 75 percent.
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75% or C
To calculate your new grade after receiving a 75 on a test, you need to know the weight of the test in relation to your overall grade. Let's assume the test is worth 20% of your total grade. You would calculate the impact of the test by finding 20% of 75, which is 15. Adding 15 points to your current grade would depend on the weight of the test and the rest of your grades in the class.
If u get 1-5 wrong A 5-10 wrong B 10-15 wrong C 15-20 wrong D 20 and up u get a F
15 out of 16 is a 93.75% (A).
15 + 5 = 20