Hi,

There are 40 questions on a class test. 

6 points are given for each correct answer  and 3 points are deducted for each incorrect answer. 

Find the number of correct answers for a test score of 105

Question states***

   6x - 3(40-x) = 105

       9x = 225

        x = 25, number of correct answers

CHECKING our answer***(15 incorrect)

   150 - 45 = 105 

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