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 student chose a number , multiplied it by 8 , then subtracted 138 from the result and got 102 . what was the number he chose ? 
Options: a ) 30 , b ) 120 , c ) 130 , d ) 140 , e ) 150
[EX A]: a

[EX Q]: Problem: the average of 10 consecutive odd numbers is 22 . what is the sum of the first 3 numbers ? 
Options: a ) 13 , b ) 45 , c ) 17 , d ) 220 , e ) 90
[EX A]: b

[EX Q]: Problem: what is the largest 4 digit number exactly divisible by 50 ? 
Options: a ) 4676 , b ) 4678 , c ) 9950 , d ) 9504 , e ) 9936
[EX A]:
c