Solve such a problem using the method of the fifth grade of elementary school, 10

Solution: There were oil drums x barrels in the first warehouse.

Then the oil barrel of the B warehouse is 3 5x.

x-90)/(3/5+90)=2/3

3x-270=6/5x+180

9/5x=450

x = 250 (barrel).

250*(3 5)=150 (barrels).

150 + 90 = 270 (barrels).

That is, the original number of oil barrels in Depot A was 250, the number of oil drums in Depot B was 150, and now the number of oil drums in Depot B is 270

This problem cannot be solved by the method of no grade in elementary school.

Solution: Set up two oil depots A and B to coexist oil x barrels.

5/8x-90=(3/8x+90)×2/35/8x-90=1/4x+60

3/8x=150

x=4002+3=5 400x3 5=240 (barrels) Answer: Now the number of oil barrels in stock B is 240 barrels.

100% right.

Solution: Let it be

3/8x+90/5/8x-90=2/3

x=400400*2 3=240 (barrels).

You don't have to.

Categories: Education, Science, >> Learning Aid.

Problem description: 1. The fifth-grade students have undergone military training this week, and the students who participated in the military training performed in a queue and formed a square queue, if this queue is increased horizontally and vertically, 39 people need to be added, and how many students are there to participate in the performance?

2. The school will hold the entrance ceremony of the sports meeting, and the athletes will be required to line up in a square formation of 9 rows and 9 columns. Later, it was requested to remove 2 rows and 2 columns, and how many athletes were asked to be reduced?

3 There are 36 Young Pioneers in the fifth (fourth) class of Nanhu, and now a representative is to be elected to participate in the first Young People's Congress held by the school, there are three candidates, A, B, and C, each person can only vote for one of them when voting, and cannot abstain from voting. Of the first 20 votes, A gets 9 votes, B gets 7 votes, and C gets 4 votes. If A is to be elected, how many votes will he have to get in the remaining votes?

4. Workers in a factory will receive a subsidy of 4 yuan during the day and 10 yuan for the night shift. A worker worked for 24 days and received a total subsidy of 144 yuan, so he was asked how many night shifts he had?

Analysis: 1. If there are x people in the horizontal row, there are x people in the vertical row.

x+x-1=39

2x=40x=20 A: There are 400 people in total.

2。(9+9-1)+(8+8-1)=32 (people) Answer: 32 people.

So A needs at least 13 votes to be elected, so it also needs 13-9 = 4 votes, and after screening 4 to 16, it gets: at least 8 more votes.

4。Set up x days of night shifts, then (24-x) day shifts.

4*（24-x）+10x=144

96-4x+10x=144

6x=48x=8 Answer: I worked the night shift for 8 days.

1.Let the language be dispersed as x, mathematics is 184-x, and English is 186-x

184-x+186-x=99×2

86 in Chinese, 98 in math, and 100 in English

2.Let the small one be x

x-10=（x+2×83）÷2

x=88 Small fraction is 88

Explain that Maths is 1x2 = 2 points higher than English.

99x2+2=200 200 2=100 Math is 100 points.

1 Let the language be x, mathematics be y, and English be z, then you can have a system of equations (x+y) 2=92 (x+z) 2=93 (y+z) 2, and let the small math score be x=99, and the solution is x=86 y=98 z=100

2. Let the small math score be x, then.

2*83+x）/3=x-10

x=983, the time used by A to B is 240 80 = 3 hours, and the time used by B to A is 240 60 = 4 hours.

The total time is 7 hours, and the average speed is 480 7 which is approximately equal to kilometers of hours.

1.（99+93+92）x2÷2=284

English: 284-92x2=100

Language: 284-99x2=86

Math: 284-93x2=98

2.Solution: Let the small math score be x

x-10=(2x83+x)÷3x=98

240x2÷（3+4)=480/7

1.The total score of the three subjects is 92 + 93 + 99 = 284, and the English score is 284-92 x 2 = 100

The math grade is 284-93x2=98

The language score is 284-99x2=86

2.Let the small math score be x

3x-(85x2+x)=30

x=1003.The time taken by A to B is 240 80 = 3 hours, and the time it takes B to A is 240 60 = 4 hours.

The total time is 7 hours, and the average speed is 480 7 km/h.

20 times 20 times 10 = 4000cm3

30 cubic = 27000cm3

27000 divided by 4000 = 6 remainder 3000cm3 up to 6.

How to pretend to draw your own drawings can be solved.

5 boxes last month the teacher let us make it, and our teacher laid it out for us.

1.Grandpa is 72 years old.

Dad is three-sixths the age of Grandpa.

Mom is eighteenth the age of grandpa.

Dad and Mom who are older?

Daddy 72x3 6 = 36

Mom. 72x8/18=32

36 is greater than 32, so dad is big.

2.Fill in the brackets with the appropriate number.

The square of the side length.

After the square is two decimal places, so the side length is one decimal place.

Because the square of 2 is 4, the square is.

The square of 3 is 9

So it's between 3 and 8 = 64, so just try it.

So the side length is, and the girth is 4*

If a side is subtracted by three meters, the area is 12 square meters less, then it can be concluded that its height is four meters, then the area of the original parallelogram is equal to ten meters, multiplied by four meters is equal to 40

You're right, but you're wrong. x*3x 2=9, x should be equal to 6. You're missing a number. So in the end the area of the small square is 6 square centimeters. The area of the large square is 54 square centimeters.

In angles.

Odd probability: c(2,1)*c(3,1) c(5,2)=3 10 Even number: 7 10