Write all the numbers lying between $10$ and $20$, which are co-prime to $15$.

In $7803*$ replace $*$ by the smallest digit to make it divisible by $11$.

In $27*6854$ replace $*$ by the smallest digit to make it divisible by $11$. 

In $*9076845$ replace by $*$ the smallest digit to make it divisible by $11$.

In $6*259$ replace $*$ by the smallest digit to make it divisible by $9$. 

In $870*3892$ replace $*$ by the smallest digit to make it divisible by $9$.

In $10935*2$ replace $*$ by the smallest digit to make it divisible by $9$.

$97657$ is divisible by $7$.

Express $2940$ as a product of prime numbers.