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: marcella has 27 pairs of shoes . if she loses 9 individual shoes , what is the greatest number of matching pairs she could have left ?
Options: a ) 22 , b ) 20 , c ) 19 , d ) 16 , e ) 15
[EX A]: a

[EX Q]: Problem: if a number x is 10 % less than another number y and y is 10 % more than 125 , then x is equal to
Options: a ) 143 , b ) 150 , c ) 123.75 , d ) 140.55 , e ) none
[EX A]: c

[EX Q]: Problem: how many positive integers less than 247 are multiple of 4 but not multiples of 6 ?
Options: a ) 20 , b ) 41 , c ) 42 , d ) 53 , e ) 64
[EX A]:
b