In a class composed of x girls y boys what part of the class is composed of girls ?
No. of girls in class=x.
No. of boys in class=y.
Part of the class is composed of girls=$$\frac{No. of girls}{No. of students}$$.
$$=\frac{No. of girls}{No. of girls+No. of boys}$$
$$=\frac{x}{x+y}$$
Hence, Option C is correct.
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