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OpenStudy (anonymous):

Brad answered 80% of the on his test correctly. There are 30 questions on the test, and all have an equal value. How many questions did he NOT answer correctly

OpenStudy (anonymous):

he had six wrong, for each ten questions he gets 2 wrong because he got 80% right. 10 times 3 equals 30, so 2 times 3 equals six.

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