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

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) (Show Source): You can put this solution on YOUR website!
Correct marks, y
Incorrect marks, x

Do E2 plus E1, finding , and then , correct answers.

incorrect answers.
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