In a competitive exam 5marks are given for every correct answer & (-2)marks are given for every incorrect answers & no marks of not attempting any questions. a. Sara scored 24 marks. How many questions has the attached incorrectly if she got 14correct answer. b. Though Neha got 9corect answer she scored (-7)marks in the exam. Find the number of question attempts by her incorrectly.
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a.
Let the number of incorrect answers of Sara be x.
Since she has 14 correct answers.
=>14(5)+x(-2)=24
=>70-2x=24
=>2x=46
=>x=23.
=>Sara has attached 23 incorrect answers.
b.
Let the number of incorrect answers of Neha be y.
Since she has 9 correct answers.
=>9(5)+y(-2)= -7
=>45-2y= -7
=>52=2y
=>y=26.
=>Neha has attached 26 incorrect answers.
Hope it is helpful.
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