There are two numbers. If 40% of the first number is added to the second number, then the second number increases to its five-fourth. Find the ratio of the first number to the second number?

A. 8 : 25
B. 25 : 8
C. 8 : 5
D. 5 : 8
E. None of these

Explanation:

Let the two numbers be x and y.

40/100 * x + y = 5/4y
=> 2/5 x = 1/4 y => x/y = 5/8