You sit for a written round in one of my quizzes . There are 20 questions. Fir every correct answer you get 10 marks and for every incorrect answer you get -5. You attempt all. Your score is 125. How many incorrect answers did you give?
Answers
Answer:
15
Step-by-step explanation:
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Answer:
You sit for a written round in one of my quizzes . There are 20 questions. Fir every correct answer you get 10 marks and for every incorrect answer you get -5. You attempt all. Your score is 125. The incorrect answers you gave equals to 5.
Step-by-step explanation:
Let x be the total number of the questions you get correct.
The questions you get wrong = 20 - x
The total marks for the correct answers = 10x
The total marks for wrong answers = -5(20 - x) = -100 + 5x
The total score is therefore equal to:
= 10x + 5x - 100
= 15x - 100
From the question, we are given the total score as 125.
Equating the two we have:
15x - 100 = 125
Let's get the value of x as follows.
15x = 125 + 100
15x = 225
x = 225/15
x = 15
The number of incorrect answers = 20 -15 = 5