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

Problem: a certain fraction has the same ratio to 1 / 33 , as 3 / 4 does to 7 / 11 . what is this certain fraction ? 
Options: a ) 1 / 14 , b ) 1 / 18 , c ) 1 / 21 , d ) 1 / 25 , e ) 1 / 28
e

Problem: in a class of 40 students 26 play football and play 20 long tennis , if 17 play above , many play neither ? 
Options: a ) 6 , b ) 8 , c ) 10 , d ) 11 , e ) 14
d

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

c