The total number of students in a school...

The total number of students in a school was 660 .the ratio of number of boys and girls was `13 :9` After some days , 30 girls joined the school and some boys left .The new ratio of number of boys and girls became `6:5` Find the number of boys who left the school .

a) 50

b) 40

c) 30

d) 60

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