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How many chickens and rabbits are there in the same cage with 21 heads on the top and 54 feet on the bottom? (the key point of thinking: suppose there are x chickens, then there are (21-x) rabbits, the number of feet of chicken + the number of feet of rabbit = 54.) Write down your ideas
2x+4(21-x)=54
x=15
There are 15 chickens and 6 rabbits respectively?
Chickens and rabbits in the same cage, 12 heads and 30 feet, ask: how many chickens and rabbits each?
If there are x chickens, there are 12-x rabbits
From the meaning of the title: 2x + 48-4 (12-x) = 30
The solution is: x = 9
So 12-x = 3
So there are nine chickens and three rabbits
Chickens and rabbits are in the same cage. The number of rabbits is three times that of chickens. There are 280 feet in total. How many chickens and rabbits are there respectively?
Suppose there are x chickens, then there are 3x rabbits. According to the meaning of the question, we can get the equation: 3x × 4 + 2x = 280, & nbsp; & nbsp; & nbsp; & nbsp; 14x = 280, & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; X = 20, 20 × 3 = 60. A: there are 20 chickens and 60 rabbits
Chickens and rabbits are in the same cage. The number of rabbits is three times that of chickens. There are 280 feet in total. How many chickens and rabbits are there respectively?
Suppose there are x chickens, then there are 3x rabbits. According to the meaning of the question, we can get the equation: 3x × 4 + 2x = 280, & nbsp; & nbsp; & nbsp; & nbsp; 14x = 280, & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; X = 20, 20 × 3 = 60. A: there are 20 chickens and 60 rabbits
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