How many electrons should be removed from a conductor so that it acquires a positive charge of 3.5nC?

Given 

Charge $q=3.5\times 10^{-9}$

Let the $nQ$ of electron to be removed be $n$

We know that 

$Q=ne$

$n=\frac{Q}{e}$

$n=\frac{3.5\times 10^{-9}}{1.6\times 10^{-19}}$

$n=2.1875\times 10^{-9+19}$

$n=2.1875\times 10^{10}$