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Huimin Primary School originally had 300 students, and this semester the number of girls increased by 5 and the number of boys increased by 4, an increase of 13 in total.

Answer: Suppose there are girls x people.

Then: 5 x + (300-x) multiplied by 4 = 313 yields: x = 1% x = 1

x = 100 people.

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Solution: If there are x girls in the original, then there are 300-x boys

5%x+(300-x)4% = 13

1%x = 1

x = 100 people.

Male students: 300-100 = 200 people).

A: There were 100 female students.

Arithmetic: 13-300x4%) 5%-4%) = 100

300 5 = 15 (person) 300 4 = 12 (person) 15-13:13-12=2:1 300 1 2+1=100 (person).

A: Huimin Primary School originally had 100 girls.

The number of female students is A

Solve a=100

If there are x girls in the original, then there are 100 girls in the original (300-x) and there are x*5% (300-x)*4%=13, and x is equal to 100, that is, there are 100 girls!

(no matter how little water you have, you have to occupy a cup, so you can't give it up, you can only enter 1) 2, this question is not clear. "Half price for children's tickets, each yuan" is a comma or a full stop in the middle.

If it is a comma indicating that the children's tickets are yuan, then the adult tickets are yuan, and if it is a full stop, then each adult ticket is yuan, and the children's ticket is yuan, at this time, a total of yuan - (yuan.

(km/h.)

5. (cm.)

Work something out. 18 (can only enter 1 can not be rounded) 2, (yuan.

3. meters, square meters.

4. Let Xiao Ming be x years old, 5x+5=75, 5x=70, x=70 5 x=14

5. The price of 6 pants is 360 (1+2)=120 yuan, and the price of the jacket is 120*2=240 yuan.

1:5) 2: Yuan 13x3=39() 39+ 3:

4:66 (km/h 5: (1)1645 18 92() 2) (3) (4)(75-5) 5=14() 5) (6)Solution:

Set pants for x yuan. 2x+x=360 x=120 Top: 2x120=240 () I made it myself, I don't know if it's right, sorry

1 will not 2Let A be x and B be y column equations: 5x-5y-10=0 4x-(2+4)=0 and x=6, y=4

3.Let the side length (landlord, you make a typo) as x, and the bottom edge length as y: 2x+y=25 x+1 2x=1 2x+y+4 solve x=7, y=3

(1) (1-3 8) 8=5 64 1 basket of cucumbers is 5 64 of all cucumbers

36 1 16 = 576 kg.

(1-3 8) 8=5 64 1 basket of cucumbers is 5 64(2)36 (1-5 64 (8+4)) of all cucumbers

36 1 16 = 576 kg.

Hope that helps.

1. The route taken by all the needle tips is an arc, the radius is 6 cm of needle length, and the arc is 240 degrees (6 degrees for a total of 40 minutes), and it is replaced by an arc of 4 3, so the length of the fan arc is l=4 3x6=8=

6 cm 2 (8:00 7:20) 60 = 6 cm 2 40 60 = cm;

When take 314 o'clock, 6 cm 2 :00 7:20) 60 = cm.

From 7:20 to 8:00, the minute hand walked 2/3 turns.

The circumference of a circle is.

Divide by 3 times 2=