The Least Common Multiple $(LCM)$ of $6$ and $20$ is . . . . . . .

Match the following items related to the properties of numbers:

$Q.1.$ $HCF$ of $25$ and $10$	$A. 5$
$Q.2.$ $LCM$ of $17$ and $11$	$B. 187$

The $\text{g.c.d.}$ of two numbers is $18$ and their product is $6480$. Their $\text{l.c.m.}$ is ..........

The numbers $525$ and $3000$ are both divisible by $3, 5, 15, 25,$ and $75$. What is $HCF(525, 3000)$? Justify your answer.

What is the $HCF$ of $65$ and $117$?

The product of the greatest common divisor ($G$.$C$.$D$.) and the least common multiple ($L$.$C$.$M$.) of two positive integers $a$ and $b$ is equal to: (where $a, b \in N$)