In a class test (+5) marks are given for every correct answer and (-3) marks are given for every incorrect answer.If Rakesh scores 23 marks by attempting 19 questions.How many questions has he attempted correctly and how many has he attempted incorrectly?
Answers
so
5x- 3( 19- x)=23
8x=80
x=10
and y=19-10=9
Answer:
The final answer is
1)The number of correct answers = 10
2)The number of incorrect answers = 9
Step-by-step explanation:
We need to find the number of questions which were attempted correctly and incorrectly by Rakesh if he attempted a total of 19 questions and earned 23 marks if +5 marks are given for every correct answer and -3 marks are given for every incorrect answer.
Let x , y be the total number of correct and incorrect answers respectively Rakesh has answered then,
x + y = 19
x = 19 - y
5x - 3y = 23
5(19 - y) - 3y =23
95 - 5y -3y = 23
-8y = 23 - 95
-8y = -72
y = 9
x = 19 - 9 = 10
The number of correct answers = 10
The number of incorrect answers = 9
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