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'.

Problem: robert ate 13 chocolates , nickel ate 4 chocolates . how many more chocolates did robert ate than nickel ?
Options: a ) a ) 4 , b ) b ) 7 , c ) c ) 9 , d ) d ) 5 , e ) e ) 2
c

Problem: find out the square of a number which when doubled exceeds its one fifth by 9 ?
Options: a ) 16 , b ) 25 , c ) 19 , d ) 26 , e ) 17
b

Problem: the difference between a number and its two - fifth is 45 . what is the number ?
Options: a ) 76 , b ) 56 , c ) 88 , d ) 66 , e ) 75
e