Example 4 - In a class test containing 15 questions, 4 marks are given

Example 4 - Chapter 1 Class 7 Integers - Part 2

Example 4 - Chapter 1 Class 7 Integers - Part 3

Example 4 - Chapter 1 Class 7 Integers - Part 4


Transcript

Question 3 In a class test containing 15 questions, 4 marks are given for every correct answer and (–2) marks are given for every incorrect answer. (i) Gurpreet attempts all questions but only 9 of her answers are correct. What is her total score? Total questions = 15 Marks for correct answer = +4 Marks for incorrect answer = −2 Number of correct answer = 9 Marks for correct answer = 4 × 9 = 36 Number of incorrect answers = Total questions − No. of correct answer = 15 − 9 = 6 Marks for incorrect answer = 6 × (−2) = −12 Therefore, Total marks = 36 + (−12) = 36 − 12 = 24 Question 3 In a class test containing 15 questions, 4 marks are given for every correct answer and (–2) marks are given for every incorrect answer (ii) One of her friends gets only 5 answers correct. What will be her score? Number of correct answers = 5 Marks for correct answers = 5 × 4 = 20 Number incorrect answers = Total questions − No. of correct answer = 15 − 5 = 10 Marks for incorrect answers = 10 × (−2) = −20 Total marks = 20 + (−20) = 20 − 20 = 0

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Davneet Singh

Davneet Singh has done his B.Tech from Indian Institute of Technology, Kanpur. He has been teaching from the past 14 years. He provides courses for Maths, Science, Social Science, Physics, Chemistry, Computer Science at Teachoo.