Urgent! Grade 6 practice problems, application problems, solving equations, etc

40+40%x=60 (1+20%)x=72 3x+25%x=50 x=60 x=4

1.There are 3 times as many girls in the reading room as there are boys, and after 8 boys come in, there are 6 more girls than boys.

5.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 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, how many male and female students are in this class? 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?

Solution: Set a schedule for x hours.

60×(x-1)=40(x+

60x-60=40x+60

60x-40x=60+60

20x=120

x=6(6-1) 60=300 (km).

Finally, the children of the formula that go in will find the total distance.

Let the distance be s 18+2) +s 18-2) =11 15 60

i.e. s 20 + s 16 = 11 1 4

Solution s = 100 (km).

Let the distance be x, and the speed of the water is 20, the reverse water velocity is 16, then x 20 + x 16 =, the solution is x = 36

Can you give an example.

82*(1+3)=328

The average score for girls is 88.

The class size is 40 people.

There are 30 boys and 10 girls.

The total score is 82*40=3280 (points).

Boys' total score = 80 * 30 = 2400 (points).

The total score of girls is 3280-2400 = 880 (points).

Average female score = 880 10 = 88 (points).

Suppose the average grade of a girl is x points, then there is.

x+3*80=4*82 x=88

The female score is 88 points.

1. Set the window air conditioner to be $ x.

x=1300

2. The design calculator table is x yuan.

x+3/5x=640

x=4003 is set to take x times.

34-5x=25-2x

x = 34 with x chickens and h rabbits.

x+h=35 2x+4h=94

x=23

1.Set up window air conditioner x yuan. x=1300 yuan2

Set up a computer desk x yuan. x+3 5=640 x=400 yuan 640-400=240 yuan3Set to take it out x times.

34-（5*x）=25-（2x） x=34.There are x chickens. 35-x=（94-2x） /4 x=23

1. Set the window air conditioner x yuan, the cabinet type is yuan, the calculator is x yuan, the chair is 3 5x yuan x + 3 5x 640 calculator: x 400 chair: 400 3 5 240 yuan 3, take x times.

34-5x 25-2xx 34, with x chickens and 35-x rabbits. 2x+(35-x) 4 94x 23 chickens with 23.

1 Set the window air conditioner x yuan, then the cabinet air conditioner yuan solution x=1300

Set x sheets of 5 corners and (x+42) sheets of 2 corners, so x=48, so donate.

There are x sheets with five corners, and y sheets with two corners.

y-x=42

x=48 of the solution

y=90x=48 total yuan.

Solution: If the one with five corners donates x pieces, then the two corners donate x+42 pieces 5x-2(x+42)=60

5x-2x-84=60

3x=144

x=48x+42=90

5x48 + 2x90 + 800 = 240 + 180 + 800 = 1220 (corner) = 122 (yuan).

Set 5 corners of A sheets, 2 corners of A + 42 sheets.

a=48

So a total of 48* was donated

Let Xiaohong have x five-corner banknotes, so Xiaohong has two-corner banknotes (x+42), and the equation can be set:

x=48, so Xiaohong donated a total of yuan.

80 yuan coin, 48 five jiao, 90 two jiao, a total of 122 yuan.

A total of 122 yuan was donated, which is not a primary school question, but a junior high school question.