instruction:
In this task, you need to provide the correct option for a given problem from the provided options.
question:
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
answer:
b


question:
Problem: in a class of 38 children , 19 play tennis , 21 play squash and 10 play neither sport . ( 1 ) how many children play both sports ? 
Options: a ) 11 , b ) 12 , c ) 14 , d ) 15 , e ) 19
answer:
b


question:
Problem: if the ratio of a to b is 2 to 3 and the ratio of b to c is 1 to 5 , what is the ratio of a to c ? 
Options: a ) 4 / 15 , b ) 1 / 3 , c ) 2 / 15 , d ) 4 / 5 , e ) 7 / 6
answer:

c