In an examination, 120 questions were asked. As there was negative marking, Reena decided not to attempt 15 questions. Each question carried 2 marks. 80% of her questions were correct. 1 mark is deducted for a wrong answer. How many marks did Reena get in this examination?
147
Total questions = 120, of which Reena did not attempt 15 questions, so she attempted 120 − 15 = 105 questions.
80% of the attempted questions were correct, so correct answers = 80% of 105 = 84.
The remaining attempted questions were wrong = 105 − 84 = 21.
Each correct answer carries 2 marks, so marks from correct answers = 84 × 2 = 168.
Each wrong answer loses 1 mark, so marks deducted = 21 × 1 = 21.
Total marks scored = 168 − 21 = 147.
Hence, Reena scored 147 marks in the examination.
Important Questions from Percentage
In an examination, 25% of the candidates failed in Mathematics and 12% failed in English. If 10% of the candidates failed in both the subjects and 292 candidates passed in both the subjects, which one of the following is the number of total candidates appeared in the examination?
What is the value of 9% of 5500 + 2.4% of 1100 - 40% of 1600?
Population of a village is 7960 in which 4660 are female. If in that village 60% are literate in which 70% female are literate, then what is the number of literate male ?
The numbers of students of three classes of a school are in the ratio 4 : 5 : 6. If numbers of students in these classes increase by 25%, 20% and 25% respectively, then ratio of numbers of students will become:
In an examination, Ram obtained 20 % more than Ashok but 10% less than Rajesh. If the marks obtained by Ashok is 1080. Then the Percentage marks obtained by Rajesh if the full marks is 2000 ;
