The success rate of the third preparatory in a governorate is , where the percentage of success of the boys is , and that of the girls is .
Determine the ratio between the number of boys and the number of girls in this grade.
Let be the number of boys and the number of girls.
Use the given information to create an equation relating and . Use that equation to find the ratio .
The success rate of for boys, for girls, and for both can be expressed as:
Divide both sides by to find the ratio
Therefore, the ratio of boys to girls is .