If a number is added to two-fifths of itself, the value so obtained is 455. What is the number ?

A. 325

B. 350

C. 400

D. 420

E. None of these

Answer: Option A

Solution(By Examveda Team)

Let the number be x
Then,
$$\eqalign{ & \Leftrightarrow x + \frac{2}{5}x = 455 \cr & \Leftrightarrow \frac{7}{5}x = 455 \cr & \Leftrightarrow x = \left( {\frac{{455 \times 5}}{7}} \right) \cr & \Leftrightarrow x = 325 \cr} $$