somaya took a test which has 20 questions. the total grade was computed by awarding 10 points for each correct answer and deducted 5 points for each incorrect answer. he answered all 20 questions and received a score of 125. how many wrong answer did he have ?
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Answer:
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
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