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In an IQ test, 4 marks are given for every correct answer and 2 marks are deducted for every wrong answer. If Crystal answered 30 questions and scored 84 marks, how many of her answer were correct?​
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In an IQ test, 4 marks are given for every correct answer and 2 marks are deducted for every wrong answer. If Crystal answered 30 questions and scored 84 marks, how many of her answer were correct?​

User Agartland
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1 Answer

4 votes
It’s 18 because
4x30=120
120-84=36
36/2=18
So the correct answer is 18.
User MooMoo Cha
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