In an examination ,a student score 6 marks for ever correct answer and loses 4 marks for every wrong answer.If he attempted 80 questions and obtained 310 marks how many questions did he attended correctly
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Answer: 63 right and 17 wrong
Step-by-step explanation:
6x-4y=310
x+y=80
4x+4y=320
10x=630
x=63
y=17
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