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There are 400 workers in the workshop, among which the ratio of female workers to male workers is 9:16. After another batch of female workers are recruited, the number of male workers accounts for 40% of the total number. How many workers are there in the workshop?
The number of male workers has not changed
There were 256 male workers at 400 × 16 / (9 + 16),
40% of the current population
So now there are: 267 / 40% = 640 people
Comprehensive formula:
400 × 16 / (9 + 16) / 40% = 640 persons
3. There are 120 male workers in the first workshop of the textile factory, and the ratio of male workers to female workers is 5:6. It is known that the number of workers in the first workshop accounts for 25% of the total number of the factory
How many workers are there in all
What do you mean? The total number of people in the textile mill?
Yes: (120 △ 5 × 6 + 120) × 4 = 1056 (person)
120：x=5:6
x=144
Total number = (120 + 144) / 25% = 1056
120/5*(5+6)/0.25=1056
120/5*(5+6)/0.25=1056
120 △ 5 × 6 + 120) × 4 = 1056 (person)
The coal was transported by two wagons, big wagons and small wagons, 9 times and 12 times respectively, with a total of 180 tons. The carrying capacity of big wagons is twice that of small wagons, and that of big wagons is 2 times that of small wagons______ What's the carrying capacity of the pickup truck______ Tons
If the cart is transported once = the trolley is transported twice, then the cart is transported nine times = the trolley is transported 18 times, the cart is transported nine times + the trolley is transported 12 times = 180 tons, then: the cart is transported 18 times + the trolley is transported 12 times = 180 tons, that is: the 180 tons is equivalent to the car (12 + 18) = 30 times, then: the small car: 180 △ 30 = 6 (tons), the big car: 6 × 2 = 12 (tons); answer: the big car is transported 12 tons each time, the small car is transported 12 tons The car transports 6 tons each time
Party A and Party B leave from ab at the same time. They meet 2.8 hours later. When they meet, Party A takes 30% of the whole journey. How many hours does it take for Party B to finish the whole journey?
It is
Unforgettable melody,
B: OK
1－30%＝70%
Every hour for the whole journey:
70%÷2.8＝1/4
B car to complete the whole journey:
1 △ 1 / 4 = 4 (hours)
There are 162 people in the two workshops of a and B cars. One fourth of the number in workshop a is equal to one fifth of that in workshop B. how many people are there in each workshop?
Let 1 / 4 of the number of people in workshop a and 1 / 5 of the number of people in workshop B be x people, then the equation 4x + 5x = 162 can be solved to get x = 18 18 * 4 = 72 18 * 5 = 90, so there are 72 people in workshop a and 90 people in workshop B
The speed ratio of a and B is 3:2. They set out from AB and go in opposite directions. After 10 minutes, they meet on the way, and it takes a few minutes for a to B
Suppose: the speed of a is x, then the speed of B is 2 / 3x1 / (x + 2 / 3x) = 10, solution x = 3 / 50, then the time from a to B is 1 / x = 50 / 3 minutes, or since the speed of a and B is 3 / 2, then the distance traveled in the same time is 3 / 2, that is to say, the distance traveled when meeting is 3 / 2, then the time from a to B is 1 before meeting
The ratio of the carrying capacity of the two cargo ships is 5:2. A batch of goods can be transported by ship a in six times. If it is transported by ship B, how many times can it be completed
If the ratio of carrying capacity is 5:2, the ratio of times of transportation is 2:5, and ship B needs to transport
6 △ 2 × 5 = 15 (Times)
A and B leave from two places at the same time. They meet in 9 hours. When they meet, car a just completes 40% of the whole journey. How many hours does car B complete the whole journey?
9 (1-40%) = 15 (hours)
There are 162 people in the two workshops. One quarter of the number in workshop a is equal to one fifth of the number in workshop B
Do not use the ordinary algorithm to solve the equation
1 / 4 of the number of people in workshop a is equal to 1 / 5 of the number in workshop B = = > workshop B is 5 / 4 of the number in workshop a
Workshop a: 162 / (1 + 5 / 4) = 72 (person)
Workshop B: 72 × 5 / 4 = 90 (person)
A x b y
x+y=162
1/4x=1/5y
x=72
y=90
The number of people in the two workshops is x and Y respectively
X+Y=162
X/4=Y/5
Substitute x = 72, y = 90
Party A and Party B set out from ab at the same time and went opposite each other. It is known that the speed of Party A is faster than that of Party B. in 8 hours, they meet at C on the way. If the speed of Party A is faster than that of Party B
Both Party A and Party B set out from ab at the same time and went opposite each other. It is known that the speed of a is faster than that of B. they met at C in 8 hours. If the speed of two people increases by two kilometers. Then the time of meeting can be shortened by 2 hours, and the distance between D point and C point is 3 km. What's your original speed?
In the summer of 2006, a certain area of China suffered from severe drought. In order to solve the problem of drinking water for villagers, the government built a reservoir beside a spring at the foot of the mountain. 40 cubic meters of spring water was injected into the reservoir every hour. In the first week, five pumps were started to pump the water in 2.5 hours, and then eight pumps were started in the second week to pump the water in 1.5 hours. Later, due to the severe drought, 13 pumps were started to supply water at the same time. How many hours can we drain this pool.
Please decipher the following Chinese character formula into a number formula. In the formula, each Chinese character represents one of the natural numbers from 1 to 9. There is no repetition;
Flowers bloom in October
X on
————————————
Gold gold gold gold gold gold gold gold gold gold gold gold gold gold gold gold gold gold gold gold gold gold gold gold gold gold gold gold gold gold gold gold
1. Let the speeds of a and B be respectively X and Y km / h
Then 8 (x + y) = 6 (x + 2 + y + 2)
It is easy to know from the proportion that B should travel further after accelerating, so the meeting point D is farther away from B
That is, 6 (y + 2) - 8y = 3
The simultaneous solution is x = 7.5km/h
The original speed of a was 7.5km/h
2. I was fooled into not understanding
twelve million three hundred and forty-five thousand six hundred and seventy-nine
* 9
eleven million one hundred and eleven thousand one hundred and eleven
Three
Flowers bloom in October
X on
————————————
Gold gold gold gold gold gold gold gold gold gold gold gold gold gold gold gold gold gold gold gold gold gold gold gold gold gold gold gold gold gold gold gold
1 2 3 4 5 6 7 9
X... Unfold
Three
Flowers bloom in October
X on
————————————
Gold gold gold gold gold gold gold gold gold gold gold gold gold gold gold gold gold gold gold gold gold gold gold gold gold gold gold gold gold gold gold gold
1 2 3 4 5 6 7 9
x 9
————————————
Put it away
12345679 times 9
Ask your teacher. Self reliance. It's easy for children to make sketches
Let a x km / S; B YKM / s
8（x+y）=6（x+2+y+2）
6（（x+2）-（y+2））=3+3
The results show that a is 5.5km/s and B is 6.5km/s
Question 1 8x-6 (x + 2) = 3
8x-6x-12=3
2x=15
x=7.5
The flowers in full bloom in October are 12345679
Let a's speed be XKM / h. B's speed be YKM / h. from the title, we can see that the distance difference between two times of a is 3km, and the formula is: 8x-6 (x + 2) = 3, the solution is x = 7.5. 8x + 8y = s... (formula 1), 6 (x + 2) + 6 (y + 2) = s... (formula 2). According to Formula 1 and 2, eliminate s, and get x + y = 14... (formula 3). Take x = 7.5 into formula 3, and get y = 6.5, that is, B's speed is 6.5km/h.. I'm also studying. This problem is not difficult. Don't be afraid to calculate it. ... unfold
Let a's speed be XKM / h. B's speed be YKM / h. from the title, we can see that the distance difference between two times of a is 3km, and the formula is: 8x-6 (x + 2) = 3, the solution is x = 7.5. 8x + 8y = s... (formula 1), 6 (x + 2) + 6 (y + 2) = s... (formula 2). According to Formula 1 and 2, eliminate s, and get x + y = 14... (formula 3). Take x = 7.5 into formula 3, and get y = 6.5, that is, B's speed is 6.5km/h.. I'm also studying. This problem is not difficult. Don't be afraid to calculate it. Put it away
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