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 Class 8 Mathematics questions and answers on ratio

In the year 2008 there were 850 pupils in a school of whom #frac{3}{5}# were boys. In the year 2009, ten girls joined the school and twenty boys transferred to another school. What was the ratio of boys to girls in the school in the year 2009?
A. 3:2
B. 53:33
C. 13:8
D. 7:5

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