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In a gym class the ratio of girls to total students is 4:7 there are 9 boys in the gym class how many students are in the gym class

In a gym class the ratio of girls to total students is 4:7 there are 9 boys in the gym class how many students are in the gym class
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in a gym class the ratio of girls to total students is 4:7 there are 9 boys in the gym class how many students are in the gym class

User SerjG
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4:7 = x/9+x.  36 + 4x = 7x.  36=3x.  x=12.  x=girls in class.  x+9=all students in class.  
User Nick Cox
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