SOLUTION: Michael is doing a multiple-choice test with 20 questions. He scores 3 marks for a correct answer and loses 1 mark if the answer is incorrect. Michael answers all the questions and
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Question 766647: Michael is doing a multiple-choice test with 20 questions. He scores 3 marks for a correct answer and loses 1 mark if the answer is incorrect. Michael answers all the questions and scores 40 marks. How many questions has he got right?
Answer by reviewermath(1029) (Show Source): You can put this solution on YOUR website!
Q:
Michael is doing a multiple-choice test with 20 questions. He scores 3 marks for a correct answer and loses 1 mark if the answer is incorrect. Michael answers all the questions and scores 40 marks. How many questions has he got right?
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A:
Let x = number of questions Michael got right
therefore, 20 - x = number of incorrect answers
3x - (20 - x) = 40
4x - 20 = 40
x =
x =
ANSWER:
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