When 2/5 of the first number is added to the second number, the second number increases by 1/4 of its value . What is the ratio between the first and the second number?

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Question

When 2/5 of the first number is added to the second number, the second number increases by 1/4 of its value . What is the ratio between the first and the second number?​

a)  8:5

b)  5:8

c)  3:7

d)  7:3

Solution

Let first number is 'f' & second number is 's' 
then , s + 2/5 f = s + 1/4 s
           2/5 f = 1/4 s
           f/s = 5/8
Ans = 5:8