Final answer:
Sarah answered 12 questions incorrectly out of a total of 35.
Step-by-step explanation:
To find the number of questions Sarah answered incorrectly, subtract the number of questions she answered correctly from the total number of questions. In this case, Sarah answered 23 questions correctly out of a total of 35 questions. Therefore, she answered 35 - 23 = 12 questions incorrectly.
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