Question

mohini scores -5 marks in the test though she got 7 correct answer how many question has he attempted in correctly

Answer 1

Marks given for 7 correct answers= 3 x 7= 21
Mohini scores= -5
Marks obtained for incorrect answers= -5 - 21= -26
Now marks given for one incorrect answer= -2
Therefore, number of incorrect answers are (-23) / (-2)= 13
Therefore Mohini has attempted 13 incorrect answers

hope it helped......

Answer 2

Answer: in test ; -2 for incorrect answers and +3 for correct answers  

Lets come straight to the point . Mohini scored -5 in the test  she had 7 correct

answers though [ 7 x 3 = 21]

*assume incorrect answers as y [ y x -2 = -2y ]

she had y incorrect answers   21 + -2y = -5  [ eg ; 5 + 3 = 8 , 3 = 8-5 ]

therefore , -2y = -5-21 = - 26  marks = -2y , which is- 26 then y = ?  -26/-2 = 13

therefore incorrect answers are 13.

You might be confused that why we divide with -2 .

That is because the marks for incorrect answers she got are

= incorrectly attempted questions x -2  again assume that y is  incorrect questions attempted

then it will be  y x -2 = -26 , then y = -26 / -2 = 13

 

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