12. In a class test marks are given for every correct answers and -2 marks are given
for every incorrect answer. Reema answered all the questions and scored 30 marks
if she gave wrong answers for 10 questions then how many correct answers had he
attempted?
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4
Answer:
30 - 10 × ( -2 ) = 30 - ( -20 )
= 50
50 ÷ 10
= 5
5 questions are correct
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