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'.

Problem: a vessel of capacity 2 litre has 20 % of alcohol and another vessel of capacity 6 litre had 55 % alcohol . the total liquid of 8 litre was poured out in a vessel of capacity 10 litre and thus the rest part of the vessel was filled with the water . what is the new concentration of mixture ?
Options: a ) 37 % . , b ) 71 % . , c ) 49 % . , d ) 29 % . , e ) 51 % .
a

Problem: for how many integer values of n will the value of the expression 4 n + 7 be an integer greater than 1 and less than 100 ?
Options: a ) 30 , b ) 28 , c ) 27 , d ) 25 , e ) 26
d

Problem: when positive integer x is divided by positive integer y , the remainder is 8 . if x / y = 76.4 , what is the value of y ?
Options: a ) 20 , b ) 22 , c ) 23 , d ) 24 , e ) 25
a