Question

In anexamination a candidate attempts 90% of total questions out of these 70% ofanswers are correct. each question carries 3 marks for the correct answer and -1 mark for wrong answer the marks secured by the candidate is 243 what is the total number of questions

Answer 1

Let total num of questions =x
attempted questions= 90x/100
correct questions= {(90x/100)70x}/100

correct questions= {(90x/100)70x}/100
i will solve it later