Homework Help: Math

Posted by Mary on Saturday, November 3, 2012 at 10:45pm.

There are 40 questions on a class test. Six points are given for each correct answer and three points are deducted for each wrong answer. Find the number of correct answers for a test score of 105.

Math - Reiny, Saturday, November 3, 2012 at 10:50pm
correct --- x
incorrect --- 40-x

6x - 3(40-x) = 105
6x - 120 + 3x = 105
9x = 225
x = 25

25 correct , 15 wrong

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