Analysis Of Your Result
What was the test ?
Let C be the number of correct answers and W be the number of wrong answers.
Since there are 20 question in total,
C + W = 20 .....(1)
and the score 125 must be subtraction of marks obtained for correct answer and marks due to wrong answers.
10C - 5W = 125 .....(2)
Multiplying (1) by 5 and then adding it to (2),
5C + 5W + 10C - 5W = 100 + 125
15C = 225
C = 15.
From (1), W = 20 - C = 20 - 5 = 5.
Hence, your 15 answers are correct while 5 answers are wrong.