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'.

[Q]: Problem: the average age of a group of 10 persons was decreased by 3 years when one person , whose age was 42 years , was replaced by a new person . find the age of the new person ? 
Options: a ) 22 , b ) 18 , c ) 12 , d ) 88 , e ) 66
[A]: c


[Q]: Problem: when average age of 22 members are 0 , how many members greater than 0 ? 
Options: a ) 17 , b ) 21 , c ) 22 , d ) 24 , e ) 25
[A]: b


[Q]: Problem: how many positive integers less than 5,000 are evenly divisible by neither 15 nor 20 ? 
Options: a ) 4,514 , b ) 4,477 , c ) 4,521 , d ) 4,428 , e ) 4,349
[A]:
b