Question

In a school, the average number of books that some numbers of boys have is 100 and average number of books that some numbers of girls have is 70. If each boy have 5 books then the average numbers of books with all the students become 80. The total number of boys is what percentage of the total number of students in that school?

A 30%
B 40%
C 50%
D 60%
E 70%
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