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There are 2400 workers in a factory, of which 5 / 8 are female workers. Later, several new female workers were recruited. At this time, the number of female workers accounts for 2 / 3 of the total number of workers?
Solution: set up x new female workers
(2400×5/8+x)/(2400+x)=2/3
1500+x=1600+2/3x
1/3x=100
x=300
A: another 300 female workers have been recruited
There are 240 workers in a workshop, and women workers account for two fifths of the total number. Later, several women workers were recruited. At this time, men workers account for one fourth of the total number. How many are the existing workers? How many are the new women workers?
There are 240x male workers (1-2 / 5) = 144
At present, 144 △ 1 / 4 = 576 people
New female workers 576-240 = 336
Before recruitment: female: 240 / 5 × 2 = 96, male: 144
After recruitment: 144 × 4 = 576
New recruit: 576-240 = 336
In a factory, the number of people in workshop a is 12 less than that in workshop B. now 10 people are transferred from workshop a to workshop B. at this time, the number of people in workshop B is four times less than that in workshop a
How many people were there in each workshop?
If there are x people in factory a, then B = x + 12. If workshop a transfers 10 people to workshop B, then a becomes X-10, and workshop B becomes x + 12 + 10. The number of people in workshop B is four times less than that in workshop a
If 3 (X-10) - 4 = x + 12 + 10, then x = 24, then a = 26. B = 38
When the two cars are 96 kilometers apart, car a runs 80% of the whole journey and car B runs 60% of the whole journey. How many kilometers are there between a and B?
A: the distance between the two places is 96% - 240 km (A: 96% - 240 km)
The distance between the two cities is 308km. After three hours, the two trains run into each other at the same time. If you know that train a is one third faster than train B, you can find the speed of train B
Let B be the speed x, then a be 4x / 3, 3 (x + 4x / 3) = 308
The final result is in kilometers per hour
1. When car a runs a quarter of the whole journey, car B runs a sixth of the whole journey. When car a arrives at place B, car B is 48 kilometers away from place A. how many kilometers are there between a and B?
2. Xiaoxiao and Taotao have a total of 22 yuan. Xiaoxiao bought five notebooks and Taotao bought four signature pens. The money is just spent. If they exchange a piece of stationery, the value of the stationery taken by Xiaoxiao and Taotao is equal, then what are the unit prices of the notebooks and signature pens?
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The above two questions need thinking
Note: don't use XY (we don't have the equation of XY yet). Don't just use words. Use the formula --
((your current wealth value is 124))
1. The speed ratio of Party A and Party B is 1 / 4:1 / 6 = 3:2, the same time distance ratio is 3:2, Party A arrives at B, the journey is 3, then Party B's journey is 2, Party B's less travel is 3-2 = 1, corresponding to the remaining 48 km, 3, 48 × 3 = 144 km, 2.5 books, 4 pens, a total of 22 yuan, each exchange one, the value is equal, that means 4 books + 1
1. You can draw a picture, draw a line segment, and draw twelve grids. Even if a walks three grids at a time and B walks two grids at a time, when a arrives at B, B still has four grids. The formula is: 12 △ 3 = 4,4 × 2 = 8,12-8 = 4 grids. The corresponding number of four grids is 48 kilometers. Then divide 48 by 4, 48 △ 4 = 12, and each grid has 12 kilometers. The twelve grids are: 12 × 12 = 144 kilometers
Second question No After the exchange, the value of stationery taken by the two people is equal, which can be expanded with 22 △ 2 = 11 yuan per person
1. You can draw a picture, draw a line segment, and draw twelve grids. Even if a walks three grids at a time and B walks two grids at a time, when a arrives at B, B still has four grids. The formula is: 12 △ 3 = 4,4 × 2 = 8,12-8 = 4 grids. The corresponding number of four grids is 48 kilometers. Then divide 48 by 4, 48 △ 4 = 12, and each grid has 12 kilometers. The twelve grids are: 12 × 12 = 144 kilometers
Second question No Follow up: continue to increase reward
The number of people in workshop a is 140 more than that in workshop B, and that in workshop B is 20% less than that in workshop A. how many people are there in workshop a and workshop B?
140 △ 20% = 700 (person) 700-140 + 700 = 560 + 700 = 1260 (person) answer: there are 1260 people in the two workshops
When the two cars are 175 kilometers apart, car a runs 80% of the whole journey, and car B runs 55% of the whole journey. How many kilometers are there between a and B?
175 / (80% + 55% - 1) = 500 km
The distance between a and B is 480 km. The passenger and freight trains leave each other and meet each other in 4 hours. Given the speed ratio of the passenger train to the train is 3:2, how many kilometers does the passenger train travel per hour
The speed ratio between the bus and the train is 3:2, so the distance ratio between the bus and the train is 3:2, that is, when the bus meets, it takes 3 / 5 of the whole journey, so the bus travels every hour
480 × (3 / 5) △ 4 = 72 (km)
480 divided by 4 = 120 is the sum of two vehicle speeds
3 + 2 = 5, what's the total
120 △ 5 = 24
24 × 3 = 72 bus
24 × 2 = 48 trains
Bus: 72 train: 48
Four hours later, car a runs a quarter of the whole journey, and car B runs 60 kilometers less than 12.5% of the whole journey. Car a and car B continue to run 735 kilometers to meet each other
After 734 + 795 km
Suppose B travels 60 kilometers more, then B travels 12.5% of the whole journey in 4 hours = 1 / 8
Then the formula (735-60) / (1-1 / 4-1 / 8) = 675 / (5 / 8) = 1080 km
Set the whole distance as a kilometer
1/4a+a×12.5%-60+735=a
5/8a=675
A = 1080 km
Can't you answer this question yet?
(735-60) / (1-1 / 4-1 / 8) = 675 / (5 / 8) = 1080 km
RELATED INFORMATIONS
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