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1. In a competitive examination, one mark is awarded for every correct answer while 1/4 mark is deducted for every wrong answer. A student answered 100 questions and got 80 marks. How many questions did he answer correctly? Solve using Cramer's rule. Let "x" and "y" be the number of questions answered correctly and incorrectly respectively.

1. In a competitive examination, one mark is awarded for every correct answer while 1/4 mark is deducted for every wrong answer. A student answered 100 questions and got 80 marks. How many questions did he answer correctly? Solve using Cramer's rule. Let "x" and "y" be the number of questions answered correctly and incorrectly respectively.

Advanced Engineering Mathematics
Advanced Engineering Mathematics
10th Edition
ISBN:9780470458365
Author:Erwin Kreyszig
Publisher:Erwin Kreyszig
Chapter2: Second-order Linear Odes
Section: Chapter Questions
Problem 1RQ
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1. In a competitive examination, one mark is awarded for every correct answer while 1/4 mark is deducted for every wrong answer. A student answered 100 questions and got 80 marks. How many questions did he answer correctly? Solve using Cramer's rule. Let "x" and "y" be the number of questions answered correctly and incorrectly respectively.
Transcribed Image Text:1. In a competitive examination, one mark is awarded for every correct answer while 1/4 mark is deducted for every wrong answer. A student answered 100 questions and got 80 marks. How many questions did he answer correctly? Solve using Cramer's rule. Let "x" and "y" be the number of questions answered correctly and incorrectly respectively.
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