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How many hours does it take for a car to travel from a to B in 3.5 hours? As above
6.3 hours
A car from a to B takes two fifths of the whole journey in 2.4 hours. It is 126 kilometers away from B. how many hours to reach B?
Please answer immediately
Also = 2.4 △ 2 / 5-2.4 = 3.6 hours
2.4*(1-2/5)/(2/5)
=3.6
3.6 hours
3.6 hours
A car needs 3 / 25L of fuel for 4 / 5km. According to this calculation, how many km can a car use per liter of fuel?
Formula: 4 / 5 △ 3 / 25 = 20 / 3 = 6 and 2 / 3 (km)
(4/5) / (3/25) = x / 1
x = 20/3 km
0.8/0.12=6.7KM
If 3 / 25 liter oil can travel 4 / 5 km, then 1 liter oil can travel 25 / 3 4 / 5 km. The formula is 1 / (3 / 25) = 25 / 3 4 / 5 * 25 / 3 = 20 / 3 km
It can also be done in one step: (4 / 5) / (3 / 25) = 20 / 3 km
Did you? I wish you progress in your studies.
At present, there are 10 trucks of type A and type B to transport 46 tons of drought relief materials to the disaster area. If the truck of type a weighs 5 tons and the truck of type B weighs 4 tons, then the truck of type A will be able to transport 46 tons of drought relief materials to the disaster area
How many transporters should be arranged at least?
At present, a total of 10 vehicles of type A and type B are used to transport 46 tons of drought relief materials to the disaster area. If the vehicle weight of type A is 5 tons and that of type B is 4 tons, how many vehicles of type A should be arranged at least?
If x cars are arranged for type A, then 10-x cars are arranged for type B
5X+(10-X)*4>=46
X>=6
Therefore, at least 6 type a cars should be arranged
A: at least 6 cars should be arranged for type a cars
A school held a sports meeting and planned to give each student a bottle of mineral water in 2011. Because the store stipulated that every seven empty bottles could be replaced with a bottle of soda, so there was no need to buy 2011 bottles
Soda, but at least how many bottles?
1724 bottles, because of 5 * 7 ^ 3 bottles, the last 5 * 7 ^ 3 + 5 * 7 ^ 2 + 5 * 7 ^ 1 + 5 = 2000 bottles and 5 empty bottles can be replaced. If you buy 9 bottles, you can get 2009 bottles + 14 empty bottles, and the second 2 bottles will be 2011 bottles!
In fact, there is a general solution to this problem~
A and B trains leave from a and B cities at the same time. When the two trains meet, they continue to move forward. When a train runs two thirds of the whole journey, B train runs four fifths of the whole journey. At this time, the distance between the two trains is 357 kilometers. How many kilometers are there between a and B cities? How many people are there in B class?
The distance between a and B is 357 km. The distance between a and B is 1 / 3 and 1 / 5 respectively. The distance between a and B is 1 / 3 and 1 / 5 respectively. 1 - 1 / 3 - 1 / 5 = 1 - 5 / 15 - 3 / 15 = 15 / 15 - 8 / 15 = 7 / 15
The addition and subtraction test questions and answers of 30 integers in grade one mathematics
We have to add and subtract,
At present, 46 tons of drought relief materials are transported to the disaster area by a and B transport vehicles. The vehicle weight of a transport vehicle is 5 tons, and the load of B transport vehicle is 4 tons. If there are no more than 10 vehicles, at least ()
A. 4 B. 5 C. 6 D. 7
Suppose that there are at least X type a transporters, and that 5x + 4 (10-x) ≥ 46x ≥ 6, so at least 6 type a transporters are required
A school held a spring sports meeting, class A and class B students to the supermarket to buy a brand of mineral water, supermarket sales methods are as follows: buy not more than 30 bottles, according to the retail price of 3 yuan per bottle; buy more than 30 bottles but not more than 50 bottles, according to the retail price of 20% off; buy more than 50 bottles, according to the retail price of 60% off. Class a two days two times to buy a total of 70 bottles of mineral water (the next day more than 30 bottles) (1) which class A or B spends more than 183 yuan? (2) How many bottles did class a buy on the first day and the second day?
(1) Class a costs: 183 yuan; class B costs: 70 × 3 × 60% = 126 yuan; 183-126 = 57 yuan. A: Class A costs more than 57 yuan. (2) class a buys x bottles of mineral water on the first day, which can be divided into three situations according to the meaning of the question: (1) no more than 30 bottles were bought on the previous day, and more than 50 bottles were bought on the second day
The distance between the two places is 640 kilometers. A and B cars are facing each other at the same time. They meet in four hours. It is known that the speed ratio of a and B cars is 5:3. When they meet, a car goes (), B car goes ()
nine hundred and fifty-seven million seven hundred and twenty-seven thousand four hundred and ninety-five
This question uses "time is fixed, speed ratio = distance ratio"
It is known that the speed ratio of car a and car B is 5:3
So, when we meet, we know that the distance ratio of car a and car B is 5:3
So a car line: 640 × [5 / (5 + 3)] = 640 × (5 / 8) = 400 (km)
B: 640 × [3 / (5 + 3)] = 640 × (3 / 8) = 240 (km)
(5x+3x)*4=640
8x*4=640
32x=640
x=20
A 20 * 5 = 100
B 20 * 3 = 60
100*4=400
60*4=240
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