Advertisements
Advertisements
Question
In a class test (+3) marks are given for every correct answer and (–2) marks are given for every incorrect answer and no marks for not attempting any question. Mohini scores –5 marks in this test, though she has got 7 correct answers. How many questions has she attempted incorrectly?
Advertisements
Solution
Marks scored for 1 correct answer = +3
Marks scored for 1 incorrect answer = −2
Marks scored by Mohini = −5
Marks scored for 7 correct answers = 7 × 3 = 21
Marks scored for incorrect answers = Total marks scored − Marks scored for 7 correct answers
= − 5 − 21
= −26
Marks scored for 1 incorrect answer = −2
Thus, number of incorrect answers = (−26) ÷ (−2)
= 13
Therefore, she attempted 13 questions incorrectly.
RELATED QUESTIONS
369 ÷ _____ = 369
(–206) ÷ _____ = 1
_____ ÷ 1 = – 87
______ ÷ 48 = –1
The temperature at 12 noon was 10°C above zero. If it decreases at the rate of 2°C per hour until midnight, at what time would the temperature be 8°C below zero? What would be the temperature at midnight?
(−200) ÷ 10 is
(–16) ÷ 4 is not same as ______.
For a non-zero integer a which of the following is not defined?
(–69) ÷ (69) = ______.
Integers are closed under division.
