instruction:
In this task, you need to provide the correct option for a given problem from the provided options.
question:
Problem: in assembling a bluetooth device , a factory uses one of two kinds of modules . one module costs $ 15 and the other one , that is cheaper , costs $ 10 . the factory holds a $ 140 worth stock of 13 modules . how many of the modules in the stock are of the cheaper kind ? 
Options: a ) 20 , b ) 25 , c ) 30 , d ) 11 , e ) 35
answer:
d


question:
Problem: income and expenditure of a person are in the ratio 10 : 7 . if the income of the person is rs . 10000 , then find his savings ? 
Options: a ) 3005 , b ) 3098 , c ) 3300 , d ) 3010 , e ) 3000
answer:
e


question:
Problem: in a ratio which is equal to 4 : 6 , if the antecedent is 20 , then the consequent is ? 
Options: a ) 72 , b ) 85 , c ) 30 , d ) 51 , e ) 45
answer:

c