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'.

Example Input: Problem: a mixture contains alcohol and water in the ratio 4 : 3 . if 8 litres of water is added to the mixture , the ratio becomes 4 : 5 . find the quantity of alcohol in the given mixture 
Options: a ) 15 litres , b ) 10 litres , c ) 30 litres , d ) 22 litres , e ) 16 litres
Example Output: e

Example Input: Problem: what will be the vulgar fraction of 0.70 
Options: a ) 3 / 5 , b ) 7 / 10 , c ) 3 / 2 , d ) 3 / 7 , e ) 3 / 8
Example Output: b

Example Input: Problem: if a ( a - 4 ) = 5 and b ( b - 4 ) = 5 , where a ≠ b , then a + b = 
Options: a ) − 48 , b ) − 4 , c ) 4 , d ) 9 , e ) 48
Example Output:
c