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In a school, the average number of books that some numbers of boys have is 80 and average number of books that some numbers of girls have is 50. If each boy have read 5 books then the average numbers of unread books with all the students become 70. The total number of boys is what percentage of the total number of students in that school?

A 60%

B 30%

C 80%

D 40%

E None of these

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