In this task, you need to answer the given multiple-choice question on the general math. Classify your answers into 'a', 'b', 'c', 'd', and 'e'.

[EX Q]: Problem: a , b and c have rs . 450 between them , a and c together have rs . 200 and b and c rs . 350 . how much does c have ? 
Options: a ) a ) 100 , b ) b ) 110 , c ) c ) 120 , d ) d ) 130 , e ) e ) 140
[EX A]: a

[EX Q]: Problem: when 1 / 10 % of 4,000 is subtracted from 1 / 10 of 4,000 , the difference is 
Options: a ) 50 , b ) 200 , c ) 396 , d ) 398 , e ) 400
[EX A]: c

[EX Q]: Problem: 1 , 1 , 3 , 9 , 5 , 25 , 7 , 49 _ , 81 
Options: a ) 6 , b ) 7 , c ) 8 , d ) 9 , e ) 10
[EX A]:
d