Detailed Instructions: In this task, you need to provide the correct option for a given problem from the provided options.
Problem:Problem: the ratio of 2 numbers is 2 : 3 and their h . c . f . is 10 . their l . c . m . is ? 
Options: a ) 30 , b ) 60 , c ) 20 , d ) 10 , e ) 40
Solution:
b