Fraction application questions the answer is 1160 people, the process should be solved, not the equ

Because the number of high school graduates left behind after graduation is the same, so the number of junior high school students is the same as the number of high school students and the number of high school students is equal to the number of junior high school students plus junior high school plus junior high school students, and the number of high school students is 5 6 of the junior high school number, which is 5 6 of the first junior high school plus 5 6 of the second junior high school plus 5 6 of the third junior high school;Considering the junior high school graduates as the whole "1", then the 5 6 of the junior high school is the number of senior high school graduates plus the total number of junior high school graduates (520) 1 6, and the 12 17 of the junior high school is the number of high school graduates, so the list can be as follows:

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If the number of junior high school graduates is x, then the number of high school graduates is x* (12 17), and the number of high school students is, and the number of junior high schools is:Because: the number of high school students is 5 6 of the number of junior high school students, so x*(12 17)+520=(x+520)*(5 6) solve:

x = 680 people, the number of high school graduates is: 680 * (12 17) = 480, so the number of high school and junior high school graduates is 680 + 480 = 1160.

If the number of junior high school students is x, the number of high school students is 5 6x high school and the total number of junior high school graduates is x+5 6x-1040

And because the number of high school graduates is 12x-520 of the number of 17/17 of the number of junior high school graduates)*12 17=5 6x-520, the solution is x=1200

There are a total of x+5 6x-1040=1160 high school and junior high school graduates.

Judging from the score of 61 points, there should be a condition of 10 points for a correct answer.

Answer: Assuming all the answers are correct, you will get 10 10 = 100 points.

If you answer a question incorrectly or not, you will be reduced by 10 + 3 = 13 points.

To score 61 points, only 100-61 = 39 points can be deducted.

Therefore, only incorrect or non-correct answers are allowed: 39 13=3 questions.

Therefore, to get 61 points, you must answer 10-3=7 correctly.

Missing condition: 10 points for a correct answer.

Let the number of incorrect questions be x and the number of unanswered questions be y

The score is known to be 61, so there are at least 7 questions answered correctly, i.e. x+y<=3,0<=x<=3,0<=y<=3.

10(10-x-y) -x-3y=61；

100-11x-13y=61;

11x+13y=39;

11x = 39 - 13y；

x<=3-y

39-13y<=11(3-y)

39-13y<=33-11y

3<=y, so y=3, x=0

The correct answer is 10-y-x=7

I haven't solved the problem for a long time, and I don't know if the character doesn't fit the current solution idea, so refer to it.

Set: If you answer the question correctly, there will be 10-x questions that you answer incorrectly or do not answer. According to the meaning of the question, the equation is as follows: conditions should be added to the question: 10 points for each question or a total score of 100 points.

10x-3x（10-x）＝61

Solution: 10x-30+3x 61

13x＝91

x 7 (channel).

1. A grain store brought in a batch of rice, sold 3 10 on the first day, and sold the remaining 4 5 on the second day, leaving 84 kilograms, how many kilograms of this batch of rice are there?

2. A piece of steel, the first time to cut off the full length of 2 5, the second time to cut off 2 5 meters, there is still half of the full length left, how many meters is the total length of this steel?

3. If you use a tractor to plough the land, if you plough 5 hectares of land every day, you can finish it in 5 days, and actually complete the task one day in advance, how much has the work efficiency improved?

1。3 10 sold on the first day, 1-3 10 = 7 10 remaining

The remaining 4 5 are sold the next day, 7 10 * 4 5 = 14 25 are sold the next day, and there are 7 50 left

There are still 84 at this time, so the total = 84 7 50 = 600

So a total of 600 kilograms.

2。There is still half of the full length left, indicating that 1 2 is truncated

The first truncation of the full length of 2 5 indicates that the second truncation of 1 2-2 5 = 1 10

The second truncation is 2 5 meters, so the total length = 2 5 1 10 = 4 meters.

3。According to the original plan, it will be ploughed in 5 days, so ploughing = 5 5 = 1 hectare per day.

Now one day earlier, so cultivated land per day = 5 4 = hectares per day.

Improved (

The amount of money before saving: Xiaogang (4 3 4 6) (3 4 2 3) = 102 yuan Xiaohong 102 2 3 68 yuan.

Now (i.e. after saving): Xiaogang 102 6 96 yuan.

Little Red 68 4 72

Xiaogang original = (4 + 6 * 3 4) (3 4-2 3) = 102

Xiaogang is now 102-6=96

Little Red is now = 96 * 3 4 = 72

(1) If the number of correct answers is x, then there are 20-x questions that are not answered or answered incorrectly, so 5x-3 (20-x) = 84, and the solution is: x = 18

Answer: You must answer 18 questions correctly to get 84 points;

80×（x+5）×8=34

Let the original processing of x pieces per hour, x(1+20%)=

210 [x(1+20%)]=(210 x) solution x=70, 70(1+20%)=84 Now a worker processes 84 per hour.

Let's assume that the number of parts processed by a worker per hour is x.

210/[x/(1+20%)]210/x=1/2

x=84

Suppose the number of parts per hour processed by a previous worker is x

Now the number of parts processed by a worker per hour is (1+20%)x210 (1+20%)x+

x = 70 Now the number of parts processed by a worker per hour = (1 + 20%) x = 84

Assuming that the product ** is 1, then the expected selling price at the beginning is, and it is bought.

70%, then the surplus income of this collection is, for the demolition of filial piety to buy the surplus goods to Zhe Shenhong set a discount of x, the total selling price is, the final profit is 82% of the original, and the formula is obtained:

x=So it's 20% off.

1.A rectangle, 20 centimeters wide, is equivalent to a length of 2 3, the area of this rectangle is how many square centimeters? (1) Long Slip Faction:

20 (2 3) = 30 (cm) Area: 30 * 20 = 600 (square centimeters) (2) Letter or total.