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'.

Input: Consider Input: Problem: the average of 5 quantities is 9 . the average of 3 of them is 4 . what is the average of remaining 2 numbers ?
Options: a ) 16.5 , b ) 10 , c ) 8 , d ) 9.5 , e ) none of these

Output: a

Input: Consider Input: Problem: village x has a population of 72000 , which is decreasing at the rate of 1200 per year . village y has a population of 42000 , which is increasing at the rate of 800 per year . in how many years will the population of the two villages be equal ?
Options: a ) 15 , b ) 19 , c ) 11 , d ) 18 , e ) 13

Output: a

Input: Consider Input: Problem: what least number must be subtracted from 427398 so that remaining no . is divisible by 12
Options: a ) 3 , b ) 5 , c ) 6 , d ) 7 , e ) 8
Output: c