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It can also be counted like this:

Solution: According to the meaning of the question.

50+60+70)x10x1+(60+70)x(15-10)x1+70x(18-15)ⅹ1

180x10+130x5+70ⅹ3

2660 (yuan).

1. Let the number of shots in the first group and the second group be 7x, 5x respectively, and get 7x-5x=6, and get x=3, so the number of shots in one group is 7x=21, and the number of shots in the second group is 5x=15.

2. The whole journey requires 3x yuan, then there is, x+2x+3x=90, x=15, so A should pay C x = 15 yuan, and B should pay C 2x = 30 yuan.

You don't have all the questions, how to do it.

Each question is incomplete, and there is one neuropathy.

2.Ton.

3.50 5 = 10 10 * 30 = 300 meters 300 + 50 = 350 meters.

4.(8+7+6) 3 yuan kg.

5.Fine Arts 800 * 5 8 = 500 Calligraphy 800-500 = 3006Female 48 * 5 8 = 30 people.

m = 3cm yuan. 9.(x+2)*(1 15+1 10)=1 The solution yields x=41045* x=3 3+ hours.

2.Ton.

3.50 5x35 = 350 meters.

4.(8+7+6) 3x2=14 yuan kg.

5.Fine arts: 500 pieces Calligraphy: 300 pieces.

6.Waitresses: 480x5 8 = 30 people.

7.12000000 4000000 = 3 cm.

8.Yuan. 10.x = 3 hours.

3+ hours.

2.A: Tons.

3.Answer: 50 + 30 * (50 5) = 350 meters.

4.(8+7+6) 3 yuan kg.

Study hard, do it yourself, take a look at the following, it's very simple!

(1): Three times.

The schematic diagram is as follows.

A with lifting B with lifting.

c with lift d with lift.

E and A lift. f and lift please wait a moment Other questions are in the process of being written.

The difference in speed is 8 km h and the distance traveled by the two at the time of meeting is 32*2=64

Then the time is 64 8 = 8 hours, and the total distance is 8 * (30 + 38) = 544 kilometers.

B also arrives at the destination The difference time is 544 30-544 38 = 8 hours.

The distance between A and B is 544 km.

B arrives first, an hour early.

The distance is 544 km, 32*2 (38-30)=8 hours, 30*8+38*8=544km, 2)544 30-544 38=? It is the time to arrive early

32 (38-30) = 4 hours.

4 (38+30) = 272 km.

B is fast and arrives at point A first.

272 30-272 38= hours.

4. (28+4)t=(28-4)(t+2), t=6, then the distance is 192 km.

Fifth, there is a lack of data, which cannot be calculated.

VI, 63. 7. The B container is small, so the water depth of the container is 10cm.

8. Since the unit price of plan B after the discount is yuan, it is more expensive than 4 yuan after the discount of plan A, and plan A can be full of 3 cars. Where you are located, you can directly choose all use plan A, that is, the total rent is 480 yuan.

Four x 24-x 32=2 x = 192

5. There is a lack of conditions for this question, how many kilometers is the first time to sail against the current?

8. Set up coach x van y rent w

40x+10y=120

x=3 y=0 w=480

x=2 y=3 w=455

x=1 y=8 w=520

x=0 y=12 w=540

So renting two buses and three vans is the most economical.

Four. Let the distance between the two places be x

x/ 28 =x /(28-8) -2

x=140V.