the radio of boy to girl is 3:4. if they were 42 students in the class , how many are boy
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Ratio of girls to boys is 3/4 which means that for every 3 girls, there are 4 boys
So right now, there are 42×{4/(4+3)} boys
42×4/7=42/7×4
= 6×4= 24 boys
Hence,the number of boys is 24
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