Mini scored 150 marks in a test getting 3 marks for each correct answer and losing 2 marks for each wrong answer. had 4 marks been awarded for each correct answer and 1 mark been deducted for each incorrect answer then she would have scored 250 marks . how many questions were therin the test if she attemted all questions
Answers
Answered by
13
Let Mini attempted correct answer be= x
and attempted wrong answer= y
According to the question
3x -2y =150 ..... (1)
4x-y = 250 ......(2)
multiply by 2 the (2) equation
8x-2y=500 .... (3)
3x-2y=150 .... (1)
subtract 1 equation from 3 equation , we get
5x=350
x=70
4x -y= 250
4*70-y= 250
280-y=250
y=30
Total questions = x+y
= 70+30=100
and attempted wrong answer= y
According to the question
3x -2y =150 ..... (1)
4x-y = 250 ......(2)
multiply by 2 the (2) equation
8x-2y=500 .... (3)
3x-2y=150 .... (1)
subtract 1 equation from 3 equation , we get
5x=350
x=70
4x -y= 250
4*70-y= 250
280-y=250
y=30
Total questions = x+y
= 70+30=100
Answered by
1
Pls refer for answer
Final answer is 100
Attachments:
Similar questions