The HCF and LCM of the two numbers are $5$ and $400$ respectively. If one of the numbers is $25$, find the other number.

As we know $HCF\times LCM=Productofthetwogivennumbers$

Let $K$ be another number.

$5\times 400=25\times K$
$K=80$

Hence, $80$ is the other number.