13 ÷ 15 = 0.866666.... or 86 2/3 % which rounds to a grade of 87.
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That would be a grade between 86% and 87%.
13/15 is about 87%, which is typically a "B". This may vary depending on the grading rules at your school
15 out of 20 would be grade of 75 percent.
15 out of 16 is a 93.75% (A).
67.5%