Question

鸡兔同笼,共有36个头,鸡脚比兔脚少42只,问鸡兔多少只?

Answer 1

鸡兔同笼,共有36个头,鸡脚比兔脚少42只,

设鸡兔x ,36-x只

2x = 4 (36-x) - 42

2x = 4x36 - 4x - 42

6x = 102

x = 17

36- 17 = 19

鸡兔各 17 19 只