12. In an examination, 20 problems are given. Each correct answer earns 5 marks and 2 marks are deducted
for every wrong answer. Ashish answered all questions and got 72
marks. Find the number of correct answers given by him.
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hii!!
here is ur answer
let no of correct answers given by Ashish is x
no of wrong answers will be 20-X
marks for the X correct answers is 5X
marks that are deducted for (20-X) wrong answers is 2(20-X)
the total no of marks Ashish got =72
5X-2(20-X) = 72
5x-40+2X=72
7X=72+40
7X= 112
X=16
16 questions are answered correctly
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