CONCEPT:-Age Problems
 -Reduce/Arrive to present/current age in most of the age problems.


SOLUTION:
 
Vimal's current age =8+2=10 years.
Father's age after 10 years=(10+10)*2 =40 years.
Father's present age=30 years
 Sneh's present age =(1/6)*30=5 years(D)