Question

The LCM and HCF of two rational numbers are equal,then the numbers must be --------- a)prime b)co-prime c)composite d)equal

Answer 1

The LCM and HCF of two rational numbers are equal,then the numbers must be equal. 
you can take two rational numbers that are equal and find there HCF than LCM and you will get the equal answer 

Answer 2

Solution:-
If the L. C. M. and H. C. F. of two rational numbers are equal, then the numbers must be equal.
So, the option (d) is correct.