What is the ratio of the number of females in the HR and Accounts department together to the number of males in the same department together?

Answer: Option A

(Number of females in HR and Accounts) : (Number of males in HR and Accounts)
= $$\left\{\left(\frac{65}{100}\times 360\right)+\left(\frac{35}{100}\times 220\right)\right\}$$       $$:\left\{\left(\frac{35}{100}\times 360\right)+\left(\frac{65}{100}\times 220\right)\right\}$$
= (234 + 77) : (126 + 143)
= 311 : 269