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: what is the average of first 21 multiples of 5 ? 
Options: a ) a ) 70 , b ) b ) 77 , c ) c ) 55 , d ) d ) 81 , e ) e ) 82
[A]: c


[Q]: Problem: lilly has 10 fish and rosy has 12 fish . in total , how many fish do they have in all ? 
Options: a ) 18 , b ) 20 , c ) 22 , d ) 24 , e ) 26
[A]: c


[Q]: Problem: 12 + 13 + 14 + . . . 51 + 52 + 53 + 54 = ? 
Options: a ) 1419 , b ) 1362 , c ) 1363 , d ) 1364 , e ) 1365
[A]:
a