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

Problem: the ratio of three numbers is 5 : 3 : 4 and their sum is 108 . the second number of the three numbers is ? 
Options: a ) 23 , b ) 27 , c ) 30 , d ) 32 , e ) 34
b

Problem: in assembling a bluetooth device , a factory uses one of two kinds of modules . one module costs $ 8 and the other one , that is cheaper , costs $ 3 . the factory holds a $ 100 worth stock of 25 modules . how many of the modules in the stock are of the cheaper kind ? 
Options: a ) 21 , b ) 20 , c ) 22 , d ) 23 , e ) 24
b

Problem: 45 pupil , out of them 12 in debate only and 22 in singing only . then how many in both ? 
Options: a ) 9 , b ) 10 , c ) 11 , d ) 12 , e ) 13

c