The ratio of the present ages of Naresh and Suparna is 7 : 3. Three years from now, the ratio of their ages will be 2 : 1. What is the current age of Naresh (in years)?

1. Let the ages be 7x and 3x. 2. After 3 years: (7x + 3)/(3x + 3) = 2/1, so 7x + 3 = 6x + 6. 3. Solving: x = 3. 4. Naresh's age = 7x = 21 years. _Source: RRB Group D CEN-02/2018 PYQ, Q.10._