Find the least number which when decreased by $11$ is divisible by $14, 15, 21, 32$ and $60$.

The least perfect square number which is divisible by $3, 4, 5, 6$ and $8$ is:

The areas of three fields are $165 \ m^2$,$195 \ m^2$,and $85 \ m^2$ respectively. In each of the fields,a flower bed of equal length has to be made. If the flower bed in each of the fields is $3 \ m$ wide,then what is the maximum length of the flower bed in each of the fields? (in $m$)

The $LCM$ of two prime numbers $x$ and $y$ $(x > y)$ is $161$. The value of $3y - x$ is

The product of two numbers is $6760$ and their $H.C.F.$ is $13.$ How many such pairs can be formed?

$A$ heap of stones can be made up into groups of $21$. When made up into groups of $16, 20, 25$ and $45$,there are $3$ stones left in each case. How many stones at least can there be in the heap?