The ratio of team a and team B is 7:8. If 30 people are sent from team a to team B, then the ratio of team a and team B is 2:3. How many people are there in team a and team B?

The ratio of team a and team B is 7:8. If 30 people are sent from team a to team B, then the ratio of team a and team B is 2:3. How many people are there in team a and team B?

The total number of people: 30 (77 + 8-22 + 3), = 30 (715-615), = 30 (115), = 450 (people); a: 450 × 715 = 210 (people); B: 450-210 = 240 (people); a: there were 210 people in team a and 240 people in team B
The ratio of team a and team B is 7:8. If 30 people are sent from team a to team B, then the ratio of team a and team B is 2:3. How many people are there in team a and team B?
The total number of people: 30 (77 + 8-22 + 3), = 30 (715-615), = 30 (115), = 450 (people); a: 450 × 715 = 210 (people); B: 450-210 = 240 (people); a: there were 210 people in team a and 240 people in team B
The number ratio of team a and team B is 7 to 3. If 30 people are sent from team a to team B, the number ratio is 3 to 2. How many people are there in each team
The original team a accounted for 7 / (7 + 3) = 7 / 10 of the total number
Now team a accounts for 3 / (3 + 2) = 3 / 5 of the total
So the total number is 30 / (7 / 10-3 / 5) = 300
A: 300 * 7 / 10 = 210
B: 300-210 = 90
If team a has 7x players, team B has 3x players
(7x - 30) : (3x + 30) = 3 : 2
x = 30
therefore
Team a = 7x = 210
Team B = 3x = 90
A: there are 210 in team a and 90 in team B
The ratio of team a and team B is 7:8. If 30 people are sent from team a to team B, then the ratio of team a and team B is 2:3. How many people are there in team a and team B?
The total number of people: 30 (77 + 8-22 + 3), = 30 (715-615), = 30 (115), = 450 (people); a: 450 × 715 = 210 (people); B: 450-210 = 240 (people); a: there were 210 people in team a and 240 people in team B
1. On a map with a scale of 1:6000000, the distance between a and B is 9 cm. If he is drawn on a map with a scale of 1 / 4000000, how many cm is the distance between a and B?
2. In a cylindrical container with a radius of 5cm on the ground, there is 10cm high water in it. A stone is completely submerged in the water, and the water surface rises to 12cm?
3. For a project, team a will complete it in 8 days and team B will complete it in 6 days. After two days of cooperation, what percentage of the project is left?
4. The turnover of Yongchang Department Store in July is 1.25 million yuan, which is 20% more than that in July. If the business tax is paid by 5%, how much should Yongchang Department Store pay in these two months?
5. The degree comparison of the three angles of an equilateral triangle () has () axes of symmetry,
6. 440 refrigerators and 320 air conditioners are sold in a shopping mall, with more refrigerators than air conditioners ()%
What's the formula
The first question is 13.5cm 6000000cm = 60km 9 * 60 = 540 (km) 4000000cm = 40km 540 / 40 = 13.5cm
The second question is 157 cubic centimeter area, 3.14 * (5 * 5) = 78.5 cm2 (12-10) * 78.5 = 157 cubic centimeter
Third question 5 / 12 1 - * 2 = 5 / 12
Fourth question: 137500 yuan 125 * (1 + 20%) = 1.5 million yuan (150 + 125) * 5% = 137500 yuan
137500 yuan
The fifth question 1:1:1 he has three axes of symmetry
Sixth question 440-320 = 120 sets 120 / 320 * 100% = 37.5%
1.6000000×9÷4000000=13.5cm
2. It should be volume... 3.14 × 5 × 5 × (12-10) = 157cm & sup3;
3.1-（1÷8+1÷6）×2=5/12
4. [125 + 125 × (1 + 20%)] × 5% = 137500 yuan
5.1:1:1 3
6.（440-320）÷320=37.5%
(in order to save time, I wrote the answer directly...)
1.13.5cm
2. Area?? The volume is 157 cubic centimeters
3. 5/12
435000 yuan
5. 1:1:1 3 axes of symmetry
6. 37.5％
1. A and B leave from both places at the same time. A travels 60 kilometers per hour, B 55 kilometers per hour. When they meet, a travels 45 thousand more than B
60-55 = 5, a travels 5 kilometers more per hour than B
45 / 5 = 9, driving for 9 hours
9 * (60 + 55) = 1035, Party A and Party B meet for 1035 km
How many vehicles transport 240 tons in 6 / 7 hours?
240 / (28 * 6 / 7) = 10 vehicles
One vehicle transports 28 * 6 / 7 = 24 tons in 6 / 7 hours
240/24=10
10 cars
The ratio of the number of colored balls among a, B and C is 9:4:2. A gives C 30 colored balls, and B also gives C several colored balls. The ratio of the number of colored balls among a, B and C is 2:1:1______ It's a colorful ball
Let a, B and C have 9a, 4A and 2a, respectively. B also gives C x balls, & nbsp; & nbsp; 9a-30 = 2 (4a-x), that is, 9a-8a = 30-2x, & nbsp; & nbsp; & nbsp; & nbsp; a = 30-2x; 4a-x = 2A + 30 + x, that is, 2A = 2x + 30, & nbsp; & nbsp; a = x + 15
On the map with a scale of 1:6000000, the length of the railway line between a and B is about 5cm. There are two fast and slow trains running from a and B at the same time, and they meet after 3 hours. It is known that the fast train runs 65km per hour and the slow train runs how many meters per hour?
5 × 6000000 ﹣ 100000 ﹣ 3 - 65 = 300 ﹣ 3 - 65 = 35 (km / h)
That is, the local train runs 35 kilometers per hour
A and B start from two places at the same time and travel in opposite directions. A travels 50 kilometers per hour and B 55 kilometers per hour. The two cars meet 15 meters away from the destination,
Car a and car B start from both places at the same time and travel in opposite directions. Car a travels 50 kilometers per hour and car B 55 kilometers per hour. The two cars meet at a distance of 15 kilometers from the midpoint,
Distance between a and B: 15 / (55-50) * (55 + 50) = 315 km
Driving time of a and B vehicles: 15 / (55-50) = 3 hours
Time = 15 × 2 (55-50) = 6 hours;
Total length = 6 × (50 + 55) = 630km
The time required for two vehicles to meet is: 15 × 2 ÷ (55-50) = 6 hours
The distance between the two places is: 6 × (50 + 55) = 630km
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