Question

Raghav scored 70 marks in a test 18 4 marks for each right answer and loss in one month for each wrong answer had 5 marks been awarded for each correct answer and two marks been deducted for each wrong answer the above would have scored 80 marks how many questions he attempted which value draggable 1 if he Resorts unfair means​

Answer 1

Answer:

Let number of right answers be x.

Let number of wrong answers be y.

According to question

4x -y=70 --------------(i)

5x-2y=80-------------(ii)

2 equation (i) - equation (ii)

8x - 2y =140

5x - 2y =80

-    +        -

__________

   3x = 60

=> x   =  20

substitution of the value of x in  

equation (i)  to get value of y

4(20)-y= 70

80 - y =70

y= 10

total number of equation are

=> 20+10 =30

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@GauravSaxena01