100 people eat 100 steamed buns, adults eat 3, and children eat 1. How many people are there? Colum

One adult eats three, and three children eat one.

25 adults.

75 children.

Your topic is unreasonable, an adult eats 3 steamed buns, and a child eats 1 steamed bun, that can only be 100 children exactly 100 steamed buns, it should be three children eat one steamed bun.

There are adults x people and children y people.

x+y=100 …①

3x+（1/3）y=100 …②

From the formula x=100-y ....③

Formula brought in formula.

3×（100-y）+（1/3）y=100

Multiply 3 on both sides of the equation at the same time

9×（100-y）+y=300

900-9y+y=300

900-300=8y

y=600÷8=75…④

Formula brought in formula.

x=100-75=25

The result was 25 adults and 75 children.

If the title is obviously wrong, it should be eaten by 3 children.

Solution 1: (Column Equation Method).Solution: If there are adults and children, then children have (100-) people, according to the question:

3ⅹ+(100-ⅹ)/3=100，9x+100-ⅹ=300，8x=200，x=25。

So there are 25 adults and 75 children.

Solution 2: (arithmetic).Number of adults: (3 1) 25

Number of villains: 25x3 75

A: There are 25 adults and 75 children.

I think it's 3 children eating one.

25x3＝75

There are 25 adults and 75 children.

x+y＝100

3x+y＝100

x ＝0 y＝100

There are 100 children in total, and there are no adults.

Set x adults, y children, x+y=100, 3x+y=100, binary equations, this equation has no solution, more than 2x is also equal to 100, which is equivalent to no adults eating steamed buns, that is, 100 children, 0 adults!!

Solution: If there are x adults, then there are (100-x) children.

3x+（100-x）=100

2x=0x=0

100-x=100

A: There are 100 children in total.

Let the adult be x and the child be (100-x) people.

Equation: 3x+(100-x)=100

How many adults should you ask this question? How many children? If there are x adults, then (100-x) children.

3x+(100-x)×1＝100

2x＝0x＝0

There were no adults, only a hundred children.

If there are x adults, then there are 100-x children, according to the title:

3x+100-x=100

2x=0x=0

100-x=100

There are no adults, only 100 children.

The first sentence of the title is "100 people eat 100 steamed buns" ......

It should be eaten by 3 children.

There are 25 adults. There were 75 children. Formula: number of adults + number of children = 100, the number of steamed buns eaten by adults + the number of steamed buns eaten by children = 100.

The analysis process is as follows:

Let's say there are y people for adults and 100-y people for children. It can be concluded that:

The three steamed buns per adult are: 3y.

A steamed bun for 3 children is: 100-y divided by 3.

So we can get 3y+(100-y) 3=100.

It is concluded that there are y=25 adults.

There were 75 children.

The division of two numbers is also called the ratio of two numbers. If ab=c(b≠0), the operation of finding another factor a using the product c and the factor b is division, written as c b, which is read as c divided by b (or b divided by c). where c is called the dividend, b is called the divisor, and the result a is called the quotient.

Solution process. Method.

Estimation method: An introductory method when you are just learning to solve equations. The solution of the equation is directly estimated and then verified by substitute for the original equation.

Apply the properties of the equation to solve the equation.

Merge Homogeneous Terms: Transforms the equation into a monomial.

Move Items: Moves items with unknowns to the left and constant items to the right.

For example: 3+x=18

Solution: x=18-3

x=15 Remove parentheses: Use the deparentheses rule to remove parentheses from the equation.

4x+2（79-x）=192

Solution: 4x+158-2x=192

4x-2x+158=192

2x+158=192

2x=192-158

x=17

If there are x adults, then there are (100-x) children.

4x+(100-x)/4=100

Solution x=20

So there are 20 adults and 80 children.

Hypothetical method: Assuming that all adults are: 3 100-100 = 200.

Children: 200 (3-1 3) = 75 people.

Adults: 100-75=25 people.

Helped!

It's a simple problem of chickens and rabbits in the same cage.

Children have: 3 100-100) (3-1 2) = 80 (person).

Adults: 100-20 (people).

Inspections (can be deleted):

80 1 2=40 (pcs).

20 3 = 60 (pcs).

60+40=100 (pcs).

Answer: There are 20 adults, 80 children, 2, 20 adults, 80 children, 2, adults are also overbearing! Hehe!

This kind of problem series equation system is easy to do: set up adults x people, children (100-x) people. 3x+(100-x) 2=100 you can solve it yourself!

You're going to give me extra points! , 2, the equation is of course easy. But there are no binary equations in elementary school.

Use the hypothetical method. It's all adults. 100 adults need 300 steamed buns, and now there are only 100 steamed buns, and the difference is 200.

Eat 6 for every two adults Eat 5 more steamed buns than two children, Explain that 2 adults can save 5 steamed buns by changing to two children To save 200 steamed buns, you need to replace 40 pairs of adults with children 200 5=40 There are 40 pairs of children (80) Adults have 100-80= 20.

200/(.2. There are x adults and y children. Column equations: x+y=100,3x+, solve the equations x=20,y=80,2, 20 adults, 80 children. , 1, it can be assumed that 100 people are all adults, then eat more: 100 3 100 200 (pieces).

An adult eats 3 0 5 more than a child

There are 200 children).

Adult: 100 80 20 (person), 1,100,0,3x+(100-x) 2=100 (let adult be x).

3x+x=20 100-x=80

20 adults.

80 children, 0, 20 adults, 80 children. Let the adult be x and the child y

x+y=100 3x+y 2=100 y 2=100-3x y=200-6x Substitute this into x+y=100 x+200-6x=100

5x=-100 x=20,y=80,0,100 steamed buns for 100 people, adults eat 3 each, children eat 2 people eat 1, ask adults. How many children are there?

I haven't studied equations and can't use them to solve problems.

Summary. There are x children and 100-x adults, and the column formula x 3 + 100 - x = 100

100 people eat 100 steamed buns, adults eat 1 steamed bun, 3 children eat 1, how many adults and how many children?

There are x children and 100-x adults, and the column is x 3 + 100-x = 100x = 0, so there are 100 adults and 0 children.

Why don't children count?

Why didn't you count it?

Eq. x 3+100-x=100

This is only true if x=0.

So the number of children is 0

Why aren't children 75 adults and 25?

This is the answer to one adult eating three, oh dear.

Because the column formula gets the result, dear.

There are 100-x adults and x children.

3×（100-x）+1/3x=100

9×（100-x）+x=300

900-9x+x=300

900-300=8x

x=75 for 25 adults and 75 for children.

100 3=300 (pcs).

300-100=200 (pcs).

3-1 3=8 3 (pcs).

200 8 3 = 75 (pcs).

100-75=25 (pcs).

A: There are 25 adults and 75 children.

It should be 25 adults and 75 children.

We can think of it this way: "Adults eat 3 each, and children eat 1 for every 3 people", that is, eat 4 and divide the 4 into a group, that is.

100 4=25 (group); There is 1 adult and 3 children in each group, that is, adults: 25 1=25 (people) Child: 25 3=75 (people).

Check: adults eat + children eat = 100, 75 1 3 + 25 3 = 25 + 75 = 100 (pieces).

There are x adults and 100-x children.

3x+(100-x）÷3=100

3x+3÷100-3÷x=100

x=25, then child=100-25

75 people. Adults are equal to 25 people.

There are x adults and 100-x children

3x+（100-x）/3=100

9x+100-x=300

10x=200

x=20 so 20 adults and 80 children.

3a + (100 people-a) 3 = 100 steamed buns [assuming that adults have a, then children have 100-a].

Finally, a = 25, which is 25 for adults and 75 for children