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'.

[EX Q]: Problem: 2.505 / 10.02 =
Options: a ) 0.35 , b ) 0.3505 , c ) 0.25 , d ) 0.351 , e ) 0.3527
[EX A]: c

[EX Q]: Problem: which number need to add to 7844213 to get a number exactly divisible by 549 ?
Options: a ) 418 , b ) 148 , c ) 448 , d ) 248 , e ) 348
[EX A]: c

[EX Q]: Problem: if a - b = 5 and a 2 + b 2 = 34 , find the value of ab .
Options: a ) a ) 4.5 , b ) b ) 12 , c ) c ) 15 , d ) d ) 18 , e ) e ) 20
[EX A]:
a