SOLUTION: Aidan 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. Aidan answers all the questions and sc

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Question 1162063: Aidan 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. Aidan answers all the questions and scores 40 marks. How many questions has he answered correctly?
Answer by josgarithmetic(39626) About Me  (Show Source):
You can put this solution on YOUR website!
Correct marks, y
Incorrect marks, x

system%28x%2By=20%2C-x%2B3y=40%29

Do E2 plus E1, finding 4y=60, and then highlight%28y=15%29, correct answers.

5 incorrect answers.