instruction:
In this task, you need to provide the correct option for a given problem from the provided options.
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: pens , pencils and markers in a jenna ' s desk are in the ratio of 2 : 2 : 5 . if there are 10 pens , the number of markers in jenna ' s desk is : 
Options: a ) 30 , b ) 22 , c ) 20 , d ) 25 , e ) 100
answer:
d


question:
Problem: a bag contains 12 red marbles . if someone were to remove 2 marbles from the bag , one at a time , and replace the first marble after it was removed , the probability that neither marble would be red is 36 / 49 . how many marbles are in the bag ? 
Options: a ) 24 , b ) 48 , c ) 84 , d ) 72 , e ) 80
answer:

c