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There are 20 chickens and rabbits in the same cage. If there are 4 more chicken legs than rabbit legs, there are () chickens and () rabbits
There are x chickens
2X-4*(20-X)=4
6X=84
X=14
There are 14 chickens and (20-14 =) 6 rabbits
In the same cage, there are 20 more rabbits and 140 fewer legs
A chicken has two legs less than a rabbit
The rabbit can be divided into two parts
The number of rabbits in the first part is the same as that of chickens, and the second part is 20 more rabbits. The rabbits in this part have 20 × 4 = 80 legs
So the rabbits in the first part have more legs than chickens, 140-80 = 60
So the number of rabbits (that is, the number of chickens) in the first part is 60 △ 2 = 30
So there are 30 + 20 rabbits = 50
At present, the same number of chickens and rabbits live together in a cage. It is known that there are 18 fewer chicken legs than rabbit legs. Q: are there any fewer chickens and rabbits?
According to the stem analysis, we can get: 18 △ 2 = 9
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