In this task, you need to provide the correct option for a given problem from the provided options.

[EX Q]: Problem: if all 6 are replaced by 9 , the algebric sum of all numbers from 1 to 100 ( both inclusive ) varies by ,
Options: a ) 980 , b ) 330 , c ) 660 , d ) 990 , e ) 300
[EX A]: b

[EX Q]: Problem: the ratio of the arithmetic mean of two numbers to one of the numbers is 5 : 7 . what is the ratio of the smaller number to the larger number ?
Options: a ) 2 : 3 , b ) 2 : 5 , c ) 3 : 7 , d ) 4 : 9 , e ) 5 : 6
[EX A]: c

[EX Q]: Problem: if 47.5 % of the 880 students at a certain college are enrolled in biology classes , how many students at the college are not enrolled in a biology class ?
Options: a ) 110 , b ) 330 , c ) 550 , d ) 462 , e ) 880
[EX A]:
d