This is the basic and conceptual question from real numbers in which we have given the product of two numbers 12960 and it is also given the HCF of these numbers is 18 and we have been asked to find the LCM of the given numbers.
RS Aggarwal, Class 10, chapter 1B, question no 5
Given : HCF =18
product of two numbers =12960
To find : LCM of two numbers
we know , product of two numbers = HCF×LCM
12960=18×LCM
LCM=720