One seventh * one eighth + one eighth times one ninth + one ninth times one tenth

One seventh * one eighth + one eighth times one ninth + one ninth times one tenth

Original formula = 1 / 7-1 / 8 + 1 / 8-1 / 9 + 1 / 9-1 / 10 = 1 / 7-1 / 10 = 3 / 70

If x + X + X + y + y = 54, x + X + y + y = 56, then x=______ ，y=______ ．

Because x + X + X + y + y = 54, x + X + y + y = 56, 2, 1 × 2 - 2 × 3, 6x + 4y-6x-9y = 108-168, 5Y = 60, y = 12; because x + X + X + y + y = 54, 3x = 54-24, x = 10

There are 28 chickens and 72 rabbits in the cage. How many chickens and rabbits are there?

Chickens = (28 × 4-72) / (4-2) = 20
Rabbits = 28-20 = 8

There are 15 chickens and rabbits in a cage. How many chickens and rabbits are there in each cage
You can't use the equation

Rabbits: (42-15 * 2) / 2 = 6
Chicken: 15-6 = 9

There are 35 chickens and rabbits in the same cage. Each chicken has two legs and each rabbit has four legs. There are 100 legs in the cage,
How many chickens and rabbits are there in the cage?

Chicken: (35x4-100) △ 4-2 = 40 △ 2 = 20
Rabbit: 35-20 = 15

Chicken and rabbit in the same cage: chicken and rabbit are in the same cage, with 8 heads on the top and 26 legs on the bottom. The answer is: there are three chickens and five rabbits, right

In the case of X chickens, there are:
2x+4（8-x）=26；
2x+32-4x=26；
2x=6；
x=3；
So 3 chickens, 8-3 rabbits = 5
Hello, I'm glad to answer for you. Skyhunter 002 will answer your questions
If you don't understand this question, you can ask. If you are satisfied, remember to adopt it
If you have any other questions, please take this question and send it to me. Please understand
I wish you progress in your study

There are 25 chickens and rabbits in the cage with 70 legs. There are () chickens and () rabbits
The equation is clear and can not be marked with "/",

25 times 2 = 50 feet 70-50 = 20 feet 20 rabbits divided by 2 = 10 chickens 25-10 = 15 chickens
If each rabbit takes back two legs with a command, then the chicken and the rabbit are two feet. A total of 25 heads, 25 times 2, calculate the total number of feet after the rabbit takes back two feet. 70-50 is equal to several rabbits take back their feet, and ten rabbits take back their feet, then there are 10 rabbits. The total minus the number of rabbits is equal to the number of chickens

There are several chickens and rabbits in the cage. There are 12 heads and 40 legs in total. How many rabbits and how many chickens are there

Suppose there are x chickens, then there are (12-x) rabbits

In a cage, there are 12 chickens and rabbits with 38 legs. How many chickens and rabbits are there?

1) In a hypothetical way
Let's say these 14 are chickens
A chicken has two legs, 14 chickens have 2 times 14 = 28 (legs), 38-28 = 10 (legs), which means that there are four legged rabbits in the cage
Since a rabbit has 4-2 = 2 legs more than a chicken, the number of rabbits is 10 divided by (4-2) = 5
Since there are 5 rabbits, there are 14-5 = 9 chickens
The comprehensive formula is as follows:
Hypothesis: there are only chickens in the cage
[38 - (14 times 2)] divided by (4-2)
=[38-28] divided by 2
=10 divided by 2
=5 (rabbits)
14-5 = 9 (chickens)
A: there are 5 rabbits and 9 chickens in the cage
(2) In a hypothetical way, you can also assume that there are only rabbits in the cage

Now the same number of chickens and rabbits are in the same cage. There are 42 more rabbit legs than chicken legs. How many chickens and rabbits are in the cage?

Each = 42 △ 4-2 = 21