In this task, you need to provide the correct option for a given problem from the provided options.
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Question: Problem: the ratio of the arithmetic mean of two numbers to one of the numbers is 5 : 9 . what is the ratio of the smaller number to the larger number ? 
Options: a ) 1 : 5 , b ) 1 : 6 , c ) 1 : 7 , d ) 1 : 8 , e ) 1 : 9

Answer: e


Question: Problem: if 25 % 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 ) 500 , b ) 600 , c ) 620 , d ) 640 , e ) 660

Answer: e


Question: Problem: the ratio of three numbers is 4 : 2 : 5 and their sum is 121 . the second number of the three numbers is ? 
Options: a ) 22 , b ) 26 , c ) 27 , d ) 29 , e ) 30

Answer:
a