Ancient prose with the same cage of chicken and rabbit

In Sun Tzu's calculation, there are pheasant rabbits in the same cage, with 35 heads above and 94 feet below. Pheasant rabbit geometry? There are a number of chickens and rabbits in a cage, counting from top to bottom, with 35 heads; It's 94 feet from the bottom. How many chickens and rabbits are there in each cage? ) solution: 2× 35 = 70 (only) 94-70 = 24 (only) 24 ÷ 2 = 12 (only) 35- 12 = 23 (only)