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To find the percentage of questions Bill answered incorrectly on the test, subtract the number of correct answers from the total questions and calculate the percentage.
Bill got 56 correct answers out of 80 questions on a test. To find the percentage of questions he answered incorrectly, subtract the number of correct answers from the total questions and calculate the percentage.
Number of questions answered incorrectly: 80 - 56 = 24 questions
Percentage of questions answered incorrectly: (24 / 80) x 100% = 30%
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