If the average of number, its 75% and its 25% is 240, then the number is :

Answer: Option C

Let the number be x
Then,
$$\begin{array}{rl}& \Rightarrow \frac{x+75\%\text{ of }x+25\%\text{ of }x}{3}=240\\ & \Rightarrow x+\frac{75}{100}x+\frac{25}{100}x=240\times 3\\ & \Rightarrow x+\frac{3}{4}x+\frac{1}{4}x=720\\ & \Rightarrow 2x=720\\ & \Rightarrow x=360\end{array}$$