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Sagot :
We were told that Chris answered 6 out of 20 Questions incorrectly. The ratio of incorrect answers to total questions is
6/20
Let x represent the number of questions that he answered incorrectly from a total of 30 questions. the ratio of incorrect to total questions is x/30
Given that this ratio is constant, it means that
6/20 = x/30
By cross multiplying, it becomes
20x = 180
x = 180/20
x = 9
If 9 answers were incorrect from 30 questions, then the number of correctly answered questions from 30 is
30 - 9 = 21
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