The ratio of the ages of Swati and Varun is 2: 5. After 8 years, their ages will be in the ratio of 1 : 2. The difference in their present ages (in years) is :

A. 24
B. 29
C. 26
D. 32
Answer: 24

Explanation:  

Let Swati age = 2x & Varuns age = 5x.
2x + 8 / 5x + 8 = 1/2 hence 2(2x+8) = (5x+8) so x=8.
Swatis age = 16 years & Varun’s age =40 years.
Difference of their ages = 24 years.