A Olympiad Mathematics question. Please help me ASAP as I need the answer by tomorrow. Tysm.

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Wilson

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A quiz was given to a class in which one quarter of the students are male.The class average score on the quiz was 16.5. Excluding three male students whose total score was 21, the average score of all the other students would be 17 while the average score of all the other male students would be 13.25. Find the average score of female students. The solution is required.

Thank you for the one who help me to solve this question?
 
In order to help you effectively, we need to know where you are having trouble. Please show whatever you have done, or any ideas you have. Then we can work with you.

The main step will be to define variables and write an algebraic equation or two. Give that a try.
 
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