45 men can complete a piece of work in 16 days. Four days they started working , 36 more men joined them. How many days will they take to complete the remaining work ?

• A. days
• B. days
• C. ${\text{6}}\frac{2}{3}{\text{ days}}$$
• D. ${\text{7}}\frac{3}{4}{\text{ days}}$$