There is a total of 16 chickens and rabbits in a farm. The total number of legs (chickens and rabbits) is equal to 50. How many chickens and how many rabbits are there?

Question

$\begin{array}{11} (a)\; \text{7 chickens and 9 rabbits} \\ (b)\; \text{9 chickens and 7 rabbits} \\ (c)\; \text{11 chickens and 5 rabbits} \\ (d)\; \text{8 chickens and 8 rabbits} \end{array}$