Who will be able to do these 2 questions The reward is 50

1.If two people meet after x minutes, then the question follows: 23x+27x=1200, so 50x=1200, so x=24

That is, after 24 minutes, the two met.

Because the distance between Xiao Ming and Xiao Qiang's starting point when the two met was the distance that Xiao Qiang traveled from departure to meeting, the distance between Xiao Ming and Xiao Qiang's starting point when the two met = 24 * 27 = 648 meters.

2.If Master Wang processes x parts per hour, then the question follows: 210 x-120 x=2, so 90 x=2, the solution is x=45, that is, Master Wang processes 45 parts per hour.

Solution: It took X minutes to set up the encounter.

27x+23x=1200

50x=1200x=24

648 (m).

A: When the two met, Xiao Ming was still 648 meters away from Xiao Qiang's starting point.

Solution: Master Wang processes x parts per hour.

2x=210-120

2x=90x=45

A: Master Wang processes 45 parts per hour.

1.The encounter took 1200 (23+27)=24 minutes, and Xiao Ming ran 23*27=552 meters.

1200-552=648 meters from Xiaoqiang's starting point.

2.Set to process x per hour.

210/x-120/x=2

x=45

1.Let the encounter take x minutes (23+27)x=1200 to get x=24 24*27=608 1200-608=5922Set 1 hour processing x hour 210 x-120 x=2 solution x=45 after testing.

x is the solution of the original equation.

This is the most standard, 1 question on the 1st floor is miscalculated, and 2 questions are not tested.

1200 50 = 24 minutes.

24*27=648m.

Use an extra 2 hours.

90 2 = 45 pcs.

1. Set the pen element ** as x, the notebook as y, and the teacher has funds a

120x=200y=a

x=a/120

y=a/200

Each set is worth x+y=a 200+a 120=a 75, so you can buy it in total.

a (a 75) = 75 (sets).

75 sets of 2, the west side of point a, the distance is 15-(15+9) 2=3m3, the equation is not in line?

Set up desks for $ x and chairs for $ y.

45x=55y

x+y=200

Solution x=55

y=45 brings a total of 55*45=2745 yuan.

If it's an elementary school.

According to the equation, think about the arithmetic solution

4. Suppose there were m people in the original audience, and the ticket was n after the price reduction

50m*（1+1/5）=n*m*

Get n = 40

The price has been reduced by 50-40 = 10 yuan.

The price of each ticket was reduced by 10 yuan to 40 yuan.

Spend 50 by buying x pieces for the first time

can know. 50 x is the unit price of this item.

Since the second time he bought 10 more pieces than the first time, x+10 is the total number of pieces he bought the second time.

3 So the product of (50 x) and (x+10) is.

If there is no discount then he should pay the money.

Because there are 12 in a dozen, (x+10) 12 is the number of hits he bought, multiplied by the number of cheap dozens.

8, then it is how much money he was cheapened in total.

4 Ben Payable - Cheap = Actually Paid.

Namely. 50 x) and (x+10) - (x+10) 12 and 8 product = 20 is the equation.

The branch of the C regiment donated the total amount.

1 3/5 25 with 3/20

The three regimental branches of A, B and C donated a lot.

320 (25 3/20) 3200 (yuan) Pei shouted this.

4. The road repair team repaired kilometers on the first day, and the second day repaired more kilometers than the first day, and how many kilometers did the road repair team in two days.

Kilometers 4, the students of Hope Primary School saved yuan by repairing tables and chairs, and bound books saved less yuan than repairing tables and chairs. How much money is saved by binding books.

Yuan 5, Xiaoliang's father bought him a set of computer desks and chairs, and the price of a chair is 45 yuan, which is cheaper than a table. How much is a table 45+ yuan.

6, the sports meeting jumped Sichuan second-hand roller market far competition, Xiaohong's results are meters, Xiao Ming jumps more than Xiaohong, and Xiaohong jumps more meters than Xiaoju. Who will come first in this long jump competition and why?

Xiao Ming Mi Xiao Ju Mi Xiao Ming is the first, because Xiao Ming jumps the farthest.

7. The students of Zhangzhuang Primary School spent more yuan on repairing tables and chairs, which was more than binding books. How much did it cost to bind the book (with equations) dollars.

8, Xiaohu went to school from home in the morning and had to walk a kilometer, and after walking a kilometer, he found that he didn't bring a math homework book, so he went home to get it. In this way, he walked many kilometers more than he usually went to school.

Mi 9, Suguo supermarket shipped tons of cantaloupe, watermelons than more tons of melons shipped, two Sichuan second-hand roller market melons transported a total of tons.

Ton 10, Aunt Zhang loaded a basket of vegetables to sell at the farmers' market, the basket and vegetables were originally weighed in kilograms, and after selling some vegetables, she went home and weighed the basket and vegetables in kilograms. How many kilograms of vegetables did she sell.

Primitive simplification y=26000-400x

y is not less than 24000

That is, 26000-400x is greater than or equal to 24000

If x is less than or equal to 5, the person who processes part B should be greater than or equal to 15

Send at least 15 people.

2.The first type: the difference in the initial investment is.

32 2 30 (yuan).

The difference in hourly electricity rates is:

Meta so used.

30 hours), the savings can make up for the initial price difference in the second way: or using a column equation:

100w=40w=

Set for more than x hours.

Ordinary lamps cost more than energy-saving lamps.

Groups of inequalities are listed according to the title.

Get x>1000

Ready-to-buy energy-saving lamps require a lifespan of more than 1000 hours.

I hope you will be satisfied with my detailed and correct answers, thank you!

If there are x red balls, then there are 140-x yellow balls.

1-1/4x=(140-x)-7

3/4x=133-x

x = 76 There are 76 red balls and 64 yellow balls.

The total number of players in both teams remains the same.

It turns out that A accounts for the total number of people: 1 (1 + 4 5) = 5 9 After sending 10 people to B, A accounts for the total number of people:

Both teams have a total of 10 (5 9-5 11) = 99 Original: 99 5 9 = 55 players.

B-original: 99-55=44 people.

A existing: 99 5 11 = 45 people.

B exists: 99-45=54 people.

I don't know how many people you ask for A and B are now or originally, they are all for you...

Solution: Let the original number of girls be x, and the original class size is y

Then: x=4 7y

x-2=5/9（y-2）

According to the system of equations, x=32 people, y=56 people.

1-4 7=3 7 3 7 3 5=29 35 42 29 35=70 people.

You don't fight me, you and I fight a lot.

The yellow ball minus 7 equals three-quarters of the red ball, so in 140-7, the remaining ball is four parts of the red ball and three parts of the yellow ball.

19 pcs. Red balls 19 * 4 = 76.

Yellow ball 19*3+7

64 pcs. A: It turns out that there are 76 red balls and 64 yellow balls.

If team A originally had x people, then team B originally had (3 7) x people (3 7) x + 10 = (2 3) * (x-10) 5x = 350

x = 70 Team B has 70 * (3 7) = 30 players.

A: Team A originally had 70 people, and Team B originally had 30 people.

If the original class size is x, then the number of girls is 3 7x.

1/2（x+6）=（3/7）x+6

x = 4242 * (3 7) = 18 people.

A: There were originally 18 students in this class.

After digging the whole length of 4 7 on the first day, the remaining part looked at the unit "1", and on the second day, the 3 5 of this unit "1" was dug and there was 2 5 left, which was equal to 42 meters. So this unit "1" is equal to:

105 meters. Looking at the unit "1" again, the full length of the canal is 105 meters 105 (1-4 7).

245 meters. A: The aqueduct is 245 meters long.

1.If there are x red balls, then there are (140-x) yellow balls.

According to the title: (1-1 4)x=140-x-7

3/4x+x=133

7/4x=133

x=76 yellow balls: 140-76=64 (pcs).

2.If team A originally had x people, then team B originally had 3 7x people.

According to the topic, there are: (x-10) 2 3=3 7x+10 move the term, remove the denominator to get 14x-9x=140+2105x=350

x = 70 Team B originally had: 70 3 7 = 30 people.

3.If the class size is x, then there will be 3 7x girls.

According to the topic, there are: (x+6) 1 2=3 7x+6 shift the term, remove the denominator to get 7x-6x=42

x=42 original girls: 42 3 7=18.

4.If the total length of the canal was x meters, 4 7 x meters were dug on the first day and 3 5 (x-4 7x) meters were dug on the second day.

According to the title, x-4 7x-3 5(x-4 7x)=42 is combined to obtain 3 7x-3 5(3 7x)=42x=245

A: The total length of the canal is 245 meters.

The distance between the two places is y kilometers, and the original planned time is x hours.

The system of binary equations can be obtained: 1, y 45 = x+

2，y/50=

Problem solving process: Add 1, y 50+1=x+ on both sides of 2 at the same time, and substitute 1 to obtain. y/45=y/50+1

The solution gives y=450, and substitutes y=450 arbitrarily into 1 or 2 to get x=

Solving this system of equations yields: y=450x=

The original scheduled time was set to x hours.

45*(x+ (both sides are distances, so equal) x=

45* (km) or 50* (km).