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Mathematics, 23.02.2021 14:00 nae878

Joey is helping his younger sister, Rachel, prepare for a certain quiz. For every question that Rachel answers correctly, Sam gives him four pieces of chocolate. For every question that Rachel answers
incorrectly, Sam takes away two pieces of candy. After 15 questions, if Rachel had answered 3
more questions correctly, she would have earned 39 pieces of candy. How many of the 15 questions
did Rachel answer correctly?

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