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: if ( 1 – 1.5 ) n = 1 , then n = 
Options: a ) − 400 , b ) − 140 , c ) − 2 , d ) 4 , e ) 400

Output: c


Input: Consider Input: Problem: a batsman makes a score of 100 runs in the 11 th inning and thus increases his average by 5 . find his average after 11 th inning . 
Options: a ) 40 , b ) 50 , c ) 62 , d ) 45 , e ) 56

Output: b


Input: Consider Input: Problem: a man is 18 years older than his son . in eight years , his age will be twice the age of his son . the present age of this son is 
Options: a ) 5 years , b ) 10 years , c ) 15 years , d ) 20 years , e ) 25 years


Output: b