A moment later, Shangde brought out a second sheet of Xuan paper, on which was written the "Chicken and Rabbit in the Same Cage" problem: "Chickens and rabbits are in the same cage, their numbers unknown; thirty-six heads are visible in the cage. If you count all the feet, there are fifty pairs in total. How many chickens and rabbits are there?"
Su You simply smiled, wrote down two equations in his notebook, and solved them in less than half a minute. This time, however, he didn't need to explain. Seeing his confidence, the coachman and Shang De could only admire him and had nothing else to say in praise. Actually, to be honest, such a problem involving two linear equations in two variables would only be taught in the first year of junior high school in later generations. Su You, who was
