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The number of female workers in a workshop is 30 less than that of male workers. The ratio of male workers to female workers is 5:3?
Male workers are X:
X ：（X-30）= 5 ：3
X=75
Then the number of people in this workshop is 75 + 75-30 = 120
The number of male workers in a workshop is 30 less than that of female workers. The number of female workers is one fifth more than that of male workers. How many workers are there in the workshop?
Three hundred and thirty
In a clothing workshop, female workers accounted for 62.5% of the total number of workers. Later, 30 female workers were recruited. At this time, the number of female workers was twice that of male workers
How many people are there in the clothing workshop?
The total number of people in the original garment factory is X
62.5%x+30=2（1-62.5%）x
0.625x+30=0.75x
0.625x+30-0.625x=0.75x--0.625x
30=0.125x
x=120
120 + 30 = 150 (person)
A and B leave from a and B at the same time and meet at the distance of 30 km. It is known that the speed of a is three times that of B
V a = 3V B
V A * t - v b * t = 30km * 2
The known conditions can only list these two equations, but there are three unknowns. There should be some conditions not given (and the problem is not given)
Both vehicles a and B drive from a to B. the express delivery of vehicle B is 20% slower than that of vehicle A. It takes 6 hours for vehicle a to complete the whole journey. How many hours does it take for vehicle B to complete the whole journey?
6 (1-20%), = 6 △ 0.8, = 7.5 (hours); a: it takes 7.5 hours for B car to complete the whole journey
The ratio of the original number of people in factory a and factory B is 7:6. After 360 people are transferred from factory a to factory B, the ratio of the original number of people in factory a and factory B is 2:3. How many people are there in factory a and factory B?
Answer: there are 2600 people in the two factories
On the highway, a 4-meter-long car with a speed of 110 km / h is going to overtake a 12 meter long truck with a speed of 100 km / h. how long does it take for the car to overtake the truck from the beginning
(4 + 12) / [(110-100) / 3.6) = 5.76 (seconds)
76 seconds.
110-100=10(KM/h) =10000m/h 14-10=4（m）
4÷10000=0.0004（h）=1.44s
=(4 + 12) / (110-100) / 1000 * 3600 = 5.76 (seconds)
A. B is 420 kilometers away from the two places. A and B cars leave from the two places at the same time and meet three hours later. It is known that the speed ratio of a and B cars is 3:4. What are the speeds of the two cars?
420 △ 3 = 140 (km), 3 + 4 = 7140 × 37 = 60 (km), 140 × 47 = 80 (km). A: the speed of car a is 60 km / h, and that of car B is 80 km / h
It takes 6 hours for car a's journey, but car B's speed is 20% slower than car a's?
One point five
The ratio of the original number of people in factory a and factory B is 7:6. After 360 people are transferred from factory a to factory B, the ratio of the original number of people in factory a and factory B is 2:3. How many people are there in factory a and factory B?
Answer: there are 2600 people in the two factories
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