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In order to transport 450 tons of yellow sand to the construction site, one third of the total amount will be transported in the first time, and two fifths of the total amount will be transported in the second time. How many tons will be transported
450 × (1-1 / 3-2 / 5) = 120 (tons)
It will take 120 tons to complete
Three hours later, 24 kilometers from the middle of the two cities, a and B meet. What's the speed of a and B?
With the equation solution, Yao problem-solving process, the best to explain clearly
Let a be x km / h and B be y km / h
Then 126 = (x + y) * 3, that is, x + y = 42
3x - 3Y = 24 * 2, that is, X - y = 16
The solution is x = 29, y = 13
[mathematics, physics and chemistry in middle school]
240 tons of coal is divided into three piles, i.e. pile a, pile B and pile C. pile a is 12 tons less than pile C. the mass ratio of pile B and pile C is 2:5?
(240 + 12) △ 5 + 2 + 5) × 5-12 = 252 △ 12 × 5-12 = 105-12 = 93 (tons) a: there are 93 tons of jiadui coal
A car travels 195 kilometers in three hours. The flight speed of an airplane is 60 kilometers less than 24 times that of a car. How many kilometers does this airplane travel per hour
one thousand and five hundred
A pile of yellow sand weighs 10 tons. One third of it was carried away for the first time and one third for the second time. How much is left
If one-third of the original is transported away for the second time, the remaining one-third, or 10 / 3 tons, will be left
If the second one carries the remaining one-third of the first one, the first two will carry 1 / 3 + (1-1 / 3) / 3 = 5 / 9
40 / 9 tons left
10-10*（1/3) - 10*(1-1/3)*(1/3)=10*4/9=40/9
10*2/3*2/3
Arrange the positive and even numbers into 5 columns as follows: A. line 126, column 2, B. line 126, column 3, C. line 252, column 2, D. line 252, column 3
The first column, the second column, the third column, the fourth column, the fifth column, the first row, the second row, the third row, the fourth row Which line are 2012, 2013 and 2014
Why are there only four numbers in a row?
2014 / 8 = 251 more than 6, so 2014 should be the third column in line 252
240 tons of coal is divided into three piles, i.e. pile a, pile B and pile C. pile a is 12 tons less than pile C. the mass ratio of pile B and pile C is 2:5?
(240 + 12) △ 5 + 2 + 5) × 5-12 = 252 △ 12 × 5-12 = 105-12 = 93 (tons) a: there are 93 tons of jiadui coal
A car travels 135 kilometers in three hours, and a plane flies 27 times faster than a car, 60 kilometers more. How many kilometers does this plane travel per hour?
Vehicle speed = 135 △ 3 = 45 km / h
Aircraft speed = 45 × 27 + 60 = 1275km / h
135 divided by 3 is 45. 45 times 27 is 1215. one thousand two hundred and fifteen plus sixty equals one thousand two hundred and seventy-five
One third of a pile of yellow sand will be used for the first time, and the remaining quarter will be used for the second time. If there are 18 tons left, how many tons are there in this pile of yellow sand?
I'm in a hurry
The second time = 1 / 3 × (1-1 / 4) = 1 / 4
4-1 / 18 in total
32 tons
Party A and Party B set out from ab at the same time. Party A travels 80 meters per minute and Party B 60 meters per minute,
If a starts 14 minutes late, they will meet at d on the way, and the distance between point e of AB and point CD is equal, then calculate the distance between two places
Let the total distance be X
Normal: when a and B meet, a walk 8 / 14x, B walk 6 / 14x, the meeting point is 1 / 14x away from the end point
A stays for 7 minutes and the meeting point is 1 / 14x from the end point
A goes 6 / 14x, B goes 8 / 14x
In seven minutes, a walked 2 / 14x less, and the distance was 7 * 80 = 560 meters
2/14X=560
X = 3920m
I hope it can help you
RELATED INFORMATIONS
- 1. The quality ratio of rice in warehouse A and warehouse B is 5:2. If 20% of the rice is taken from warehouse A and put into warehouse B, then the rice in warehouse A is 12 tons more than that in warehouse B. how many tons of rice are there in warehouse A and warehouse B?
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