Elementary school equation solving application problems plus answers .

1.A primary school three. Four.

A total of 585 trees were planted in the fifth grade, the number of trees in the fourth grade was 1 5 in the fifth grade, and the number of trees planted in the third grade was 3 4 in the fifth grade. 2.In a certain year, the rainy days in July are 8 11 less than the sunny days, and the number of cloudy days is 3 22 sunny days, how many rainy days are there in this month?

3.There are a total of 152 students in the fifth grade of a school, and 1 11 boys and 5 girls are selected to participate in the math competition, and the rest of the students are exactly equal. 4.

There are two iron wires 44 meters long, if the first one is cut off 1 5, and the second one is connected to the meter, then the two are equal, how many meters are the original length of each of the two?

A: 3 4 * 300 = 225 trees in the third grade, 300 * 1 5 = 60 trees in the fourth grade, and 300 trees in the fifth grade.

2 If someone rides a bicycle from home to the train station, if they travel 15 kilometers per hour, then they can arrive 15 minutes before the train starts, if they travel 9 kilometers per hour, they will arrive 15 minutes later than the driving time, and now they plan to arrive 10 minutes earlier than the driving time, how many kilometers per hour should they travel?

Answer: The distance between the two places is: 15*[1-15 60]=km.

Then arrive 10 minutes early, an hour should be done:. 5 km.

3 canteens buy flour and rice, the weight of flour is twice that of rice, eat 15 kilograms of rice and 20 kilograms of flour every day, a few days later the rice is all eaten, there are 80 kilograms of flour left, how many kilograms of rice and flour are bought in this canteen?

Solution: Let rice be x kilograms, then flour is 2 x kilograms, then the time is x 15 days, so there is 20 * (x 15) + 80 = 2x, and the solution is x = 120So 120 kg of rice and 240 kg of flour.

The following is a little easier.

1: Car A travels for 10 hours, vehicle B travels for 7 hours, and car A travels 276 kilometers more than car B. If the speed of the two trains is the same, find the speed of the two trains. (party).

2: Chen and Zhang ride bicycles from the same spot in opposite directions at the same time. Kilometers away after hours. Chen travels 12 kilometers per hour, how many kilometers does Zhang travel per hour? (party).

3: The number of bookcases sold by the furniture factory is one-fifth of the five x cabinets, and the bookcases sold are 120 less than the five x cabinets. (party).

4: To make a rectangular tin box with 60 square decimeters, the length of the bottom is 4 decimeters, the width is 3 decimeters, and what is the height? (party).

5: The master processes 80 parts, which is 10 less than the 2 companions processed by the apprentice. How many apprentices process? (party).

6: The apprentice processes 45 parts, which is 5 more than half of the master's. How many are processed by the master? (party).

Answer: 1A x B y

10x-7y=267

10/x+7/y=1

2.sheets x 12+x)*

3.Bookcase x five x cabinet y

x = one-fifth * y

x=y-120

4.Height x 4 * 3 * x = 60

5.Apprentice x2x-10=80

6.Master x one-half * x + 5 = 45

If a car travels from A to B 300 kilometers away at an average speed of 40 kilometers per hour for the first 120 kilometers, what speed should the car travel at for the rest of the journey?

300 50 = 6 (hours).

120 40 = 3 (hours).

Solution: Let the rest of the distance travel x kilometers per hour.

120＋（6－3）x=300

120＋3x=300

3x=180

x=60A: The rest of the journey is 60 kilometers per hour.

1.Solve the following equations.

7x+ 20x+2

35+2.Judgment. (Right, hit "?.")"Wrong hit"?”

1) The solution of Equation 4 is x=. (

2) The second step in solving the equation is x=. (

3) The number A is 56, which is 6 times more than the number x 2, and the equation for finding the number B is: x+6 2=56. (

4) The equation equal to the solution of the equation is 12x-8x=. (

3.Hangzhou and Shanghai are 210 kilometers apart, and two cars, A and B, drove opposite each other from the two places at the same time, and the two cars met after 3 hours. It is known that car A travels 32 kilometers per hour, how many kilometers does car B travel per hour?

Think of it this way: according to the topic, speed and time of encounter = distance.

4.Mom bought 4 bars of soap and 4 towels, shared 50 yuan, and the towels were 9 yuan each. How much does soap cost per bar?

The key and difficult points are all in one place.

5.Electronics stores sold a total of 360 air conditioners and refrigerators in May, and the number of air conditioners sold was twice as many as refrigerators. How many air conditioners and refrigerators are sold?

6.The two production teams A and B make the same kind of parts, and Group A does 40 fewer parts in 1 hour than Group B in 3 hours. Group A produces 326 pieces per hour, how many pieces does Group B produce per hour?

7.The school library bought 820 science and technology books, 40 more than twice the number of literature and art books. How many literary books did you buy?

8.The number of books on the upper layer of the book bar is double that of the lower layer, and if you take 5 books from the upper layer to the lower layer, the number of books on the two floors is the same. How many books are there on each of the upper and lower floors?

9.Solve life problems.

You must know the story of "Newton and the Apple Falling to the Land". Today, let's also make a "little Newton", when the fruit is ripe, it falls from the tree to the ground, and the height of its fall is related to the elapsed time as follows:

Time t (seconds).

Height h(m) 5 5 5

1) The formula for h is represented by t, h=

2) What is the value of h when t=?

10.Do you know what is 5a+2b=440, a+b=100, a, b?

Answer

1. x= x=2 x= x=34

2. (1)? 2)? 3)? 4)? 3.38 km 4Yuan.

5.Refrigerator: 100 air conditioners: 260 6122 pcs.

7.390 Ben 8Lower level: 20 Upper level: 30

9.(1) h=5t2 (2)h=5t2=5 (early Mi).

Xiao Dong, Xiao Ming, Xiao Hua and the school are on the same side of a straight road. Xiaodongjia is 1 km away from the school, the distance between Xiaoming's house and the school is 110% of Xiaodong's distance from the school, and the distance between Xiaohua's house and the school is twice that of Xiaodong's distance from the school.

Solution: Xiao Ming: 1+110%=

Xiaohua: 1 The first case: Xiaodong and Xiaoming are both on the same side of the school.

Then the distance between Xiaodong and Xiaoming's house =

The second case: Xiaodong Xiaoming is on both sides of the school.

Then the distance between Xiaodong and Xiaoming's house = 1+

Make a trapezoidal frame with iron wire, the two bottom corners of the frame are equal, if the upper bottom is required to be ten meters long, the lower bottom is twice as long as the upper bottom, and a waist is 13 meters long, how many meters of iron wire is needed for this frame?

Solution: The upper bottom: 10 Then the bottom is 10*2=20 Two waists: 13*2=26

10 + 20 + 26 = 56 meters.

A: This frame requires at least 56 meters of wire.

What is the volume of a steel pipe with an inner circle diameter of 60 centimeters, an outer circle diameter of 80 centimeters, and a length of 6 meters?

Solution: v= (r -r)*l

1318800cm³

The sales volume of a cigarette factory in the first half of the year is 30 million yuan, if the consumption tax is paid according to the sales volume of 45, how many yuan should be paid in the first half of the year?

Solution: 3000*45%=1350 (10,000 yuan).

There are a number of children, each of whom gets 3 apples, and there are 2 left, a total of 17 apples, how many children are there?

Solution: There are x children, then.

3x+2=17

The solution is x=5

A: There are 5 children.

1.Transporting a batch of goods, these two large trucks have been rented twice in the past: the first time 2 cars A and 3 cars B, transported tons The second time 5 cars A and 6 cars B transported 35 tons of goods Now rent 3 cars A and 5 cars B If you pay 30 yuan per ton for freight, ask the owner how much yuan should pay.

Solution: Let A be loaded with x tons, and B can be loaded with Y tons, then.

2x+3y=

5x+6y=35

Get x = 4y = get (3x + 5y) * 30 = 735

2. The price of a product is reduced by 10%**. In order to keep the total amount of sales unchanged. How many percent more sales than if you were selling at the original price?

Solution: Increase x% when selling at the original price

1-10%)*1+x%)=1

x% = In order to keep the total amount of sales unchanged. The sales volume is higher than when it was sold at the original price.

After the price of a product is reduced by 10%, it is exactly 40 yuan more than half of the original price, and what is the original price of the product?

Solution: Set the original price to X yuan.

1-10%)x-40=

x=100A: The original price is 100 yuan.

4. There are 40 grams of salt water with 8% salt content, how many grams of salt need to be added to make the salt water contain 20% salt?

Solution: Add x grams of salt.

Pure salt is 40*8% gram at the beginning.

Adding x grams is 40*8%+x

The brine is 40+ x grams.

Concentration 20% so (40*8%+x) (40+x)=20%.

x = 6 so add 6 grams of salt.

5. A market egg trading is priced according to the number of eggs, a trader buys a batch of eggs per yuan, but accidentally breaks 12 on the way to trafficking, and the remaining eggs are sold at each yuan, and the result is still profitable. Q: How many eggs did the vendor buy?

Solution: Suppose the vendor bought x eggs at the beginning.

List the equations according to the title:

x-12)*

x=364A: The vendor bought 36 eggs.