question_answer

Mary finds that in the final year examination of mathematics, the question paper consists of section I, II, and III respectively. The questions of section I carries 4 marks each which contains five questions and section II and III carries 6 and 8 marks each which contains ten and five question each respectively. If she scores \[100%\] in section I and \[80%\] in section II, then find the least number of questions required by Mary to be solved correctly in the third section in order to have an average of \[90%\].

A)  2                                

B)  3

C)  4                                

D)  5

E)  None of these