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If five people answer eight questions each, then there are 40 total questions.

5 x 8 = 40

If 12 of those 40 answers are wrong, then 30% of the questions are wrong. This leaves 70% of the questions to be right.

12 / 40 = 0.3

0.3 = 30%

40 - 12 = 28

28 / 40 = 0.7

0.7 = 70%

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Q: When 5 people had to answer 8 questions each for an experiment In total 12 answers were wrong What is the percentage of wrong and right answers please?
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