Uncle Lin s family has a total of 90 chickens and sheep, a total of 270 chickens and sheep, and how

Suppose there are x chickens, then there are (90-x) sheep.

2x+4(90-x)=270

That is, 2x+360-4x=270

i.e. 2x=90

i.e. x = 45 chickens and 45 sheep.

90x2=180 feet for the chickens and sheep minus two feet each, 270-180=90 for the remaining feet of the sheep, 90 2=45 sheep, so the chickens have 90-45=45 chickens.

According to the title, if there are x chickens, then the sheep are (90-x). The equation according to the foot number series of chickens and sheep is as follows:

Column equation: 2x+4x(90-x)=270

Solve the equation: 2x+360-4x=270

2x=90x=45

So there are 45 chickens and 45 sheep.

Uncle Sherin's family raised x chickens, and 90-x sheep.

A chicken has 2 legs, and a sheep has 4 legs.

2x+4（90-x）=270

2x+360-4x=270

2x=90x=45

So, there are 45 chickens and 90-45 = 45 sheep.

Solve the problem of raising x chickens, 2x + (90-x) * 4 = 2702x + 360-4x = 270

2x=360-270

2x=90x=45

There were 45 chickens and 45 sheep.

There are only a number of chickens: Cong Xun.

4*40-100) infiltrates this (4-2).

30 pcs. Number of sheep in a match: 40-30=10.

This kind of question is very simple, as long as you can have superpowers, first call those sheep to lift two feet, so that the chicken has two feet below, and the sheep only has two feet below, a total of 25 * 2 = 50 feet below, that is to say, the sheep have a total of 10 feet, of which each sheep has raised two feet, and you can find a total of 5 years old bent chain sheep raised their feet, and then use 25 minus 5 to get that there are 20 chickens and 5 sheep.

There are 30 chickens on the farm, and the number of sheep is 20% less than that of chickens, and there are 24 sheep.

Equation according to the title:

1-20%）x30=（=

So there are 24 sheep.

Nature of Hybrid Operations:In mathematics, when the first-level operation (addition and subtraction) and the second-level operation (multiplication and division) are in the same equation at the same time, their order of operation is first multiplication and division, then addition and subtraction, if there are parentheses, they are counted in the parentheses first and then the parentheses, and the order of operations at the same level is from left to right.

The subtraction of natural numbers is not closed. It can be closed unless the subtraction is greater than the subtraction. For example, 26 cannot be subtracted by 11.

This situation uses one of two methods, saying that 26 cannot be subtracted from 11; Represent a negative number with the answer as an integer, so subtracting 26 from 11 results in -15.

First, let the chicken and the sheep put away their legs at the same time, and the sheep is standing, 560-440 = 120 2 = 60 sheep 220-60 = 160 chickens.

Let the sheep be x and the chicken be y, and we can get 4x 2y=560 from the question

x+y=220 two formulas are bipolar, x=60, y=160

There are x chickens and y sheep.

2x+4y=560

x+y=220

y=60，x=160

There are 160 chickens and 60 sheep.

Make an equation where the chicken is x and the sheep is y, i.e., x+y=220, and 2x+4y=560

Suppose they are all chickens then there are 90 legs, and now there are 96 legs, and a sheep has 2 more legs than a chicken, 96-90 = 6 (pieces), which means that 6 2 = 3 sheep are regarded as chickens, so there are three or three sheep, then there are 42 chickens, so there are 39 more chickens than sheep.

A chicken has 2 legs, a sheep has 4 legs, the number of legs of the sheep is 2 times the number of legs of the chicken, let the chicken be x and the sheep be y, then:

x+y=45

2x+4y=96

x=42 and y=3

There are 39 more chickens than sheep.

Suppose the sheep is a, then the chicken is (45 a), 4a 2 (45 a) 96, 90 2a 96, and the solution is: a 3, that is: 3 sheep, 42 3 39

So: there are 39 more chickens than sheep.

a+b=452a+4b=96 Equation 1: Multiply by two 2a + 2b = 90 Equation 2- Equation 32b = 96-90 = 6b = 3a = 42 There are 42 chickens and 3 sheep.

There are 39 more chickens than sheep.

Chickens and rabbits in the same cage.

There are 3 sheep (96-45*2) (4-2).

Sheep are 45-3-3 less than chickens 39.

Suppose the state law: when it's full of sheep.

92 72 20 (this is an extra leg, it belongs to the chicken) 20 2 10 (the chicken has a leg, so the first chicken is counted as 10 auspicious postures) 23 10 13 (the number of sheep).