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: if a is a positive integer , and if the units digit of a ^ 2 is 9 and the units digit of ( a + 1 ) ^ 2 is 4 , what is the units x digit of ( a + 2 ) ^ 2 ? 
Options: a ) 1 , b ) 3 , c ) 5 , d ) 6 , e ) c . 14
[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: if ( 1 / 5 ) ^ m * ( 1 / 2 ) ^ 5 = 1 / ( ( 10 ) ^ 5 ) , then m = 
Options: a ) 1 , b ) 2 , c ) 3 , d ) 4 , e ) 5
[EX A]:
e