question_answer

The mean marks (out of 100) of boys and girls in an examination are 64 and 80 respectively. If the mean marks of all the students in that examination is 73, then the ratio of the number of girls to the number of boys is ________

A) 8 : 9                                                                 

B) 9 : 7

C) 4 : 1                                                     

D) 3 : 5

E) None of these