Salaries of A and B are in the ratio 4 : 5 . If the salary of each is increased by ₹3000 then new ratio becomes 5 : 6 . What is A's salary?

2000 12000 4500 5000

12000

Let Actual salary of A's  = 4R  & Actual salary of B's  = 5R Now, ATQ ⇒ \(\frac{4R\;+\;3000}{5R\;+\;3000}\) = \(\frac{5}{6}\) ⇒ (24R ) + (18000) = (25R ) + (15000 ) ⇒ R = 3000 Here, A's salary = 4R =  4 × 3000  = Rs.12000/-