13/15 is about 87%, which is typically a "B". This may vary depending on the grading rules at your school
87% or B+
66.67% D
93.
83%
77%
A (96%)
75% or C
83% or B
your grade would be 80% or a B-
75% or a "C".
15 / 31 * 100% = 48.39% Usually you need to obtain 50% or over to pass an exam or test.
Our Miss Brooks - 1952 Do It Yourself 2-15 was released on: USA: 22 January 1954