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Seven trucks have transported 36 tons of sand and soil in six trips. Now there are 560 tons of sand and soil. How many more trucks need to be added after five trips? I didn't learn the division of fractions
Seven trucks transported 36 tons of sand in six trips
Each truck carries 36 △ 7 △ 6 = 6 / 7 tons of sand
Each truck carries 5 times sand 6 / 7 × 5 = 30 / 7 tons
Now there are 560 tons of sand and soil, which need the same truck after five times of transportation
560 △ 30 / 7 = 560 × 7 △ 30 ≈ 130.7 = 131 vehicles
Need to add the same truck 131-7 = 124
In Feng Zikai's article fingers, what are the advantages and disadvantages of thumb, index finger, middle finger, ring finger and little finger
Thumb: strength: can bear hardships. Weakness: not beautiful shape, short and fat body, big and fat head, simple structure. Index finger: strength: diligent, dare to take risks. Weakness: the body has no other three fingers, slim, strong curve. Middle finger: strength: beautiful curve. Weakness: almost never work, effort. Ring finger: strength: beautiful posture. Weakness: beautiful
Thumb: not beautiful is willing to bear hardships. Index finger: No, it's complicated. Middle finger: the work of caring for the superior is a little supporting. Ring finger: beautiful and lovely, weak ability.
The thumb suffers, the index finger is injured, the middle finger is good, the ring finger and the little finger are appendages
Linear equation of one variable
It takes five days and nights for a ship to go from Chongqing to Shanghai, and seven days and nights for a ship to go from Shanghai to Chongqing. How many days does it take for a wooden card to go downstream from Chongqing to Shanghai? (regardless of any other factors)
Second question
For a job, Party A works alone for 10 days, Party B works alone for 12 days, Party C works alone for 15 days, and Party A and Party C work together for 2 days. A leaves, C does it alone for three days, and B comes in. How many days will it take to finish the work?
If the speed of the boat is x, the speed of the water is y, and the distance between Shanghai and Chongqing is a, it takes t days for the rafts to float downstream from Chongqing to Shanghai. If the speed is X-Y, then 7 * (X-Y) = A-1, if the speed is x + y, then 5 * (x + y) = A-2, if the speed is X-Y, then 7 * (X-Y) = A-1
Six
Five
Thirty-five
Let the static water velocity be V1, the ship velocity be V, and the distance be s
s/(v+v1)=5
s/(v-v1)=7
obtain
(v+v1)/s=1/5
(v-v1)/s=1/7
subtract
2v1/s=2/35
s/v1=35
It will take 35 days
It takes 10 times to transport a batch of coal by a large truck and 15 times by a small truck. If the coal is transported by a large truck for 4 times and then by a small truck, how many times will it take?
It takes 10 times to transport with a large truck, and 1 / 10 can be transported at a time
4 times, 1 / 10 * 4 = 2 / 5
1-2 / 5 = 3 / 5 left
It takes 15 times to transport with a small truck, and one time can be 1 / 15
3 / 5 / (1 / 15) = 9 times
Final formula: [1 - (1 / 10) * 4] / (1 / 15) = 9
Suppose the total coal quantity is 150x
Big trucks can transport 15x, small trucks can transport 10x
T = (150x-60x) / 10x = 9, so the pickup truck has to transport 9 times
The total amount of coal is 150x
Big trucks can transport 15x, small trucks can transport 10x
T = (150x-60x) / 10x = 9, so the pickup truck has to transport 9 times
What's the posture of the five fingers in fingers? Fingers () thumb () index finger () middle finger, ring finger and little finger ()
What's the posture of the five fingers in finger? Finger (short and big, fat, simple structure, people have two joints, he has only one.) thumb (all straight and hard curves) index finger (the best position and most magnificent of the five fingers, not like the middle finger. He lives in the center, there are barriers on the left and right, he is the tallest,) middle finger, ring finger and little finger () Ring finger and little finger are beautiful and lovely
A. The distance between B and B is 100km, and a and B start from a and B by bike and walk towards each other
A's speed is 23km / h, and B's speed is 21km / h. After a ride for an hour, B starts from B. how many hours after B starts, will the two meet? (please solve the equation with one variable)
Set: two people meet x hours after B sets out
According to the meaning and known, there are:
23(x+1)+21x=100
23x+21x+23=100
44x=77
X = 2.75 hours
A: the two met 2.75 hours after B set out
23 * x + 21 * x + 23 = 100; X = 77 / 44
A canteen needs to transport 72 tons of coal. It is known that each large truck can transport 10 tons of coal, and the freight is known that each large truck can transport 10 tons of goods, and the freight is 20 yuan
Freight 4 tons, freight 9 yuan, please design a scheme, how many large and small trucks, total freight?
Four carts and eight carts are 152 yuan in total
Xiaoming counts the fingers of his left hand, the thumb is 1, the index finger is 2, the middle finger is 3, the ring finger is 4, the little finger is 5, and then reverses, the ring finger is 6, the middle finger is 7, the index finger is 8, the thumb is 9, and then reverses, the index finger is 10?
2014 ÷ (5 + 5) = 201 more than 4, then it starts from the thumb, and 4 is the ring finger
A. The first time they met at a distance of 7 ㎞ from place B, after meeting, they continued to move forward and returned immediately after reaching their destination. When they returned, they met at a distance of 4km from place A. how many kilometers is the distance between place a and place B
The distance between a and B is 3 × 7-4 = 17 (km)
For the first time, B walked seven kilometers. The two sides took a total journey.
The second meeting B walks 21 kilometers. The two sides took a total of three trips.
Whole journey: 21-4 = 17 km. B walked 4 kilometers after the whole journey and met for the second time. At this time, B walks a total of 21 kilometers.
See?
After completion, how many trucks can transport goods in two hours?
60 / 12 = 5 (hours) 60 / 15 = 4 (hours)
60 / (4 + 5) = 3 / 20 (hours)
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