Advertisements
Advertisements
प्रश्न
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. Radhika scored 20 marks. If she has got 12 correct answers, how many questions has she attempted incorrectly?
उत्तर
Marks scored for 1 correct answer = +3
Marks scored for 1 incorrect answer = −2
Marks scored by Radhika = 20
Marks scored for 12 correct answers = 12 × 3 = 36
Marks scored for incorrect answers = Total marks scored − Marks scored for 12 correct answers
= 20 − 36
= −16
Marks scored for 1 incorrect answer = −2
Thus, number of incorrect answers = (−16) ÷ (−2)
= 8
Therefore, she attempted 8 questions incorrectly.
APPEARS IN
संबंधित प्रश्न
(–206) ÷ _____ = 1
_____ ÷ 1 = – 87
An elevator descends into a mine shaft at the rate of 6 m/min. If the descent starts from 10 m above the ground level, how long will it take to reach −350 m?
How many −4’s are there is (−20)?
The value of 5 ÷ (–1) does not lie between ______.
51 ÷ _____ = – 51
113 ÷ _____ = –1
(–95) ÷ ______ = 95
[(–32) ÷ 8] ÷ 2 = –32 ÷ [8 ÷ 2]
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?
