16. (10 points) There are 100 chickens and rabbits in total, and they have 260 feet in total. How many chickens and rabbits are there?

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16. (10 points) There are 100 chickens and rabbits in total, and they have 260 feet in total. How many chickens and rabbits are there?
【Solution】Solution: Assume all are rabbits,
$$
\begin{array}{l}
\text { Chickens: }(4 \times 100-260) \div(4-2) \\
=140 \div 2 \\
=70 \text { (heads) }
\end{array}
$$

Rabbits: $100-70=30$ (heads)
Answer: There are 70 chickens and 30 rabbits.