In a class, there are 'z' students. Out of them 'x' are boys. What part of the class is composed of girls ?
A
$$\frac{{x}}{{y}}$$
B
$$\frac{{z}}{{x}}$$
C
1 - $$\frac{{x}}{{z}}$$
D
$$\frac{{x}}{{z}}$$ - 1
Correct Answer: 1 - $$\frac{{x}}{{z}}$$
Total students = zTotal boys = x
Total girls = z - x
⇒ $$\frac{{{\text{Number of girls}}}}{{{\text{Total students}}}}$$
= $$\frac{z - x}{{z}}$$
= 1 - $$\frac{x}{{z}}$$
