Salaries of Ravi and Sumit are in the ratio 2 : 3. If the salary of each is increased by Rs.4000, the new ratio becomes 40 : 57. What is Sumit’s present salary? 

$$\begin{gathered} \text{ Let the original salaries of Ravi and Sumit be Rs. }2x\text{ and Rs. }3x\text{ respectively. } \\ \text{then }\frac{2x+4000}{3x+4000}=\frac{40}{57} \\ \begin{array}{l}\Rightarrow 57(2x+4000)=40(3x+4000)\\ \Rightarrow 6x=68,000\\ \Rightarrow 3x=34,000 \\ \text{ Sumit's present salary }=(3x+4000)=\text{ Rs. }(34000+4000)=\text{ Rs. }38,000.\end{array} \end{gathered}$$