Question

mahesh took a testwitch had 20 question.the total grade was computedby awarding 10 point for each correct answer and deducting 5point each incorrect answer .Mahesh answer all 20 question's and received a score of 125.how many answer did he have?​

Answer 1

$\bf\large\underline\blue{Solution :-}$

He has 20 questions, which leads us to the total marks of the questions asked in test, provided, 10 marks for each right answer, total marks = 20 * 10 = 200

Marks he scored = 125

Marks he lost = 75

Marks deducted for 1 wrong answer = 5

Number of wrong answers if 5 marks are deducted = 1

Number of wrong answer if 1 mark is deducted = 1/5

Number of wrong answers if 75 marks are deducted = 75 * 1/5 = 15

He had 15 wrong answers.