z cm long 9. A rectangular sheet of paper is 12 cm 10. Suman studies for 5 hours. She devotes 2 hours of her time for science and mathematics. How much time does she devote for other subjects? 11. Arrange the following in ascending and descending order 2 2 8 5.321 SOLVE THE FOLLOWING (4 MARKS EACH). (04) 12. 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 questions Radhika scored 20 marks. If she has got 12 correct answers, how many questions has she attempted incorrectly? Mohini scores in this test, though she has got 7 correct answers. How many questions has she attempted incorrectly?
Answers
1.Given :
Total time = 5 2/3
Science and Mathematics = 2 4/5
According to the question :
❍ Total time = 5 2/3
=> 5 × 3 + 2 / 3
=> 15 + 2 / 3
☃️=> 17 / 3
❍ Time for Science and Mathematics = 2 4/5
=> 2 × 5 + 4 / 5
=> 10 + 4 / 5
☃️=> 14 / 5
❍ Time for other subjects = ( 17 / 3 - 14 / 5 ) [ LCM for 5 and 3 = 15 ]
=> ( 17 × 5 / 15 - 14 × 3 / 15 )
=> 85 - 42 / 15
=> 43 / 15
☃️=> 2 13/15
❥ So, It's Done ❥ !!
2.Answer:
Radhika- 8 questions
Mohini-13 questions
Step-by-step explanation:
a) Radhika- 1) 12 correct answers means marks scored = 12*(+3)=36 mrks for correct answer.
2) Marks scored =20
Correct answers' marks =36
Negative marks=36-20=16
3) 16 marks means no.of questions = 16/2=8 questions
4) Hence 8 questions were answered wrongly
b)Mohini- 1) 7 correct answers means 7*(+3) marks =21 marks
2) Marks scored = -5
correct answers' marks= 21
Negative Marks = 21-(-5)=21+5=26
3) 26 marks means no. of questions =26/2 = 13 questions
4) Hence 13 questions were answered wrongly
Answer:
10. = 2 (13/15) hours. Therefore, the time he devote for other subjects = 2(13/15) hours.
12. Now, we know that for every incorrect answer =−2 marks. So, the total marks for incorrect answers = marks for incorrect answer × number of incorrect answers. Hence, the number of incorrect answers is 13.