On a certain multiple-choice test, 9 points are awarded for each correct answer, and 7 points are deducted for each incorrect or unanswered question. Sally received a total score of 0 points on the test. If the test has fewer than 30 questions, how many questions are on the test?

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9*(#correct) - 7*(#wrong) = 0 --given

there are two variables there and only one equation, need one more to be able to solve

Cannot be determined
16
19
21
24

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