Comment: I was a teacher for 13 years

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I was a teacher for 13 years

And I'm sorry I clicked on this thread.
Your daughter doesn't have a teacher.
She has an a-s-s-h-o-l-e giving her problems that probably have several different possibilities for correct answers.

We don't know if this a-s-s-h-o-l-e intends for the student to take

(18/28 of the class was wearing shorts.) to mean 9/14, .6428571 or 9 out of 14 or even 18 out of 28 students are wearing shorts.

(4/5 of the class was girls.) So if 4/5 of the class are girls that would mean 80% or 11.2 of the students are girls wearing shorts.

Now we don't know how many students are in the process of undergoing gender change so I would say there is not enough information to come to the correct conclusion.

In all probability the teacher was so busy getting ready for the next grievance meeting that he/she may have just missed a typo in the question.