Question : In a class, there are $z$ students. Out of them, $x$ are boys. What part of the class is composed of girls?
Option 1: $\frac{x}{z}$
Option 2: $\frac{z}{x}$
Option 3: $1–\frac{x}{z}$
Option 4: $\frac{x}{z}–1$
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Correct Answer: $1–\frac{x}{z}$
Solution :
Given:
Students = $z$
Boys = $x$
According to the question,
Girls = Students – Boys = $z - x$
So, the part of the $z$ composed of girls is $\frac{\text{Girls}}{\text{Students}}= \frac{z-x}{z}= 1-\frac{x}{z}$
Hence, the correct answer is $1-\frac{x}{z}$.
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