The decimal form of $\frac{6}{15}$ is ............

The $\text{l.c.m.}$ of two numbers is $14$ times their $\text{g.c.d.}$ and the sum of $\text{l.c.m.}$ and $\text{g.c.d.}$ is $600$. If one of the numbers is $280$,then find the other number.

Find the $LCM$ and $HCF$ of the following integers by applying the prime factorisation method: $17, 23$ and $29$.

There is a circular path around a sports field. Sonia takes $18$ minutes to drive one round of the field,while Ravi takes $12$ minutes for the same. Suppose they both start at the same point and at the same time,and go in the same direction. After how many minutes will they meet again at the starting point?

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

The $HCF$ of $25$ and $52$ is $1$.