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

Problem: income and expenditure of a person are in the ratio 10 : 4 . if the income of the person is rs . 19000 , then find his savings ? 
Options: a ) 79754 , b ) 87689 , c ) 59875 , d ) 11400 , e ) 87648
d

Problem: how many of the positive factors of 36 , 84 and how many common factors are there in numbers ? 
Options: a ) 2 , b ) 4 , c ) 3 , d ) 5 , e ) 6
e

Problem: a ratio between two numbers is 3 : 4 and their l . c . m . is 84 . the first number is 
Options: a ) 60 , b ) 45 , c ) 21 , d ) 15 , e ) none

c