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Qin class of x students, when 2 more boys and 7 more girls are added, the ratio of boys to girls change from 2/3 to 3/5

in class of x students, when 2 more boys and 7 more girls are added, the ratio of boys to girls change from 2/3 to 3/5. what is the value of x?

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#1My mother. the end -Answered at 2013-02-10 05:26:34
let the number of boys be x1.number of girls be x2. x1+x2 = x Given that x1/x2 = 2/3 ====> 3x1-2x2=0 ----->equation (1) after adding x1+2/x2+7 = 3/5 ====> 5x1-3x2=11 ----->equation (2) sloving 1 and 2 , we get x1,x2 as 22,33 respectivly. So the total is 55 students.
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in class of x students, when 2 more boys and 7 more girls are added, the ratio of boys to girls change from 2/3 to 3/5

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