In a class test containing questions, marks are given for every correct answer and marks are given for every incorrect answer. Sunita attempts all questions and gets correct answers. What is her total score?
Answer
marks
The correct answer is marks — Calculate the total score by adding the marks obtained for correct and incorrect answers: marks.
Step-by-step solution
- Find the number of incorrect answers given by Sunita: Total questions = , Correct answers = , so Incorrect answers = .
- Calculate the marks obtained for correct answers: marks.
- Calculate the marks obtained for incorrect answers: marks.
- Calculate the total score by adding the marks obtained for correct and incorrect answers: marks.
Common mistake: Students often fail to multiply the number of incorrect answers by , or forget to subtract the penalty from the positive score.
Concept tested: Application of addition and multiplication of integers in daily life problems
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