The relation between the sale (s) and the profit (p) of a certain company is given by the equation $2\mathrm{s}-15\mathrm{p}=-\frac{5}{2}$. If the profit for a certain week is Rs. 7.5 lakhs, then find the sale of the company in that week. 

The given equation is $2\mathrm{s}-15\mathrm{p}=-\frac{5}{2}$. 

On substituting p = Rs. 7.5 lakhs in the given equation, we obtain

$2\mathrm{s}-15\times 7.5=-\frac{5}{2}$

$\Rightarrow 2\mathrm{s}-112.5=-2.5$

=> 2s = 110

=> s = 55

Thus, the company made sales worth Rs. 55 lahks in that particular week.