In this task, you need to provide the correct option for a given problem from the provided options.

[EX Q]: Problem: in 50 l can , milk and water in the ratio of 3 : 1 . if the ratio has made 1 : 3 then the quantity of water that has to be added further is ? 
Options: a ) 100 , b ) 120 , c ) 90 , d ) 80 , e ) 70
[EX A]: a

[EX Q]: Problem: sachin is older than rahul by 7 years . if the ratio of their ages is 11 : 9 , find the age of sachin 
Options: a ) 24.5 , b ) 24.8 , c ) 38.5 , d ) 24.88 , e ) 24.19
[EX A]: c

[EX Q]: Problem: for a positive integer n , if 5 ^ n is a factor of 20 ! , but 5 ^ n + 1 is not a factor of 20 ! , what is the value of n ? 
Options: a ) 4 , b ) 6 , c ) 7 , d ) 8 , e ) 9
[EX A]:
a