there are 90 multiple choice questions in a test. suppose you get 2 marks for every correct answer and for every question you leave or answer wrongly 1 mark is deducted from total score of correct answers. if you get 20 marks in the test, then how many questions did you answer correctly ?
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2
Answer:
It is given that 2 marks are awarded for every correct answer. Hence, we get the number of marks scored for correct answers =2x . We know that 1 mark is deducted for every wrong answer which gives the number of marks to be deducted for wrong answers =(90−x)×1=(90−x) .
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Answer:
Answer:Let the number of answered question correctly be'x'
The number of question answer correctly will be 90-x
Total Mark's obtained=60
Mark's obtained for correct answer =22
Mark's deducted for wrong answer=-1(90-2)=x-90
2x+2-90=60
3x=150
×=150/3
x=50
Therefore the number of question answered correctly is 50
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