Algebra
posted by Delila .
Olivia is taking a test that has 30 questions.She earns 9 points for every correct answer and loses 5 points for every wrong answer (questions left blank also count as wrong answers) . If Olivia’s score is 18 , how many questions did she answer correctly on the test .

Algebra 
scott
9 c  5(30  c) = 18 ... 14 c  150 = 18
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