標題:
發問:
There are 18 True-or-False question in a Mathematics test.2 marks will be given for each correct answer and 1 mark will be deducted for each wrong answer.If Mimi answers all the questions and gets 24 marks ,how many correct answer has she got?
最佳解答:
2y-(18-y) = 24 2y-18+y = 24 3y-18 = 24 3y = 24+18 3y = 42 y = 42 / 3 y = 14 answer : y= 14 答案: y=14 因為: 2y + y =3y 3y-18=24 3y-18+18=24+18 3y=42 3y/3=42/3 y=14 I hope that I can help you.
其他解答:
y = correct answers she got 2y = marks for correct answers 18-y = wrong answers, also means the mark deducted the algebra, 2y-(18-y)=24 Steps: Let y be the number of correct answers she got. 2y-(18-y) = 24 2y-18+y = 24 3y-18 = 24 3y = 24+18 3y = 42 y = 42 / 3 y = 14 ∴ She got 14 correct answers.
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求步驟+答案發問:
There are 18 True-or-False question in a Mathematics test.2 marks will be given for each correct answer and 1 mark will be deducted for each wrong answer.If Mimi answers all the questions and gets 24 marks ,how many correct answer has she got?
最佳解答:
2y-(18-y) = 24 2y-18+y = 24 3y-18 = 24 3y = 24+18 3y = 42 y = 42 / 3 y = 14 answer : y= 14 答案: y=14 因為: 2y + y =3y 3y-18=24 3y-18+18=24+18 3y=42 3y/3=42/3 y=14 I hope that I can help you.
其他解答:
y = correct answers she got 2y = marks for correct answers 18-y = wrong answers, also means the mark deducted the algebra, 2y-(18-y)=24 Steps: Let y be the number of correct answers she got. 2y-(18-y) = 24 2y-18+y = 24 3y-18 = 24 3y = 24+18 3y = 42 y = 42 / 3 y = 14 ∴ She got 14 correct answers.
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