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In a hurry! Answer in half an hour! Elementary school mathematics sixth grade score application problem! There are two piles of coal a and B. pile a is 120 tons more than pile B. If 25 tons are transported from pile B to pile a, the weight ratio of pile AB is 5:3. How many tons of coal are there in pile a and pile B?
A is 120 tons more than B
25 tons from B to a,
A is more than B: 120 + 25 × 2 = 170 tons
At this time, B has: 170 ÷ (5-3) × 3 = 255 tons
original,
B: 255 + 25 = 280 tons
A: 280 + 120 = 400 tons
A desk costs 10 yuan more than a chair. If the unit price of a chair is 35 yuan of that of a desk, how much is the unit price of the desk and chair?
Suppose the unit price of the desk is x yuan, then the unit price of the chair is 35x. According to the meaning of the question, we get the following result: the unit price of the desk is 25 yuan, and the unit price of the chair is 15 yuan
On the application of distance in the fifth grade of primary school
1. A car goes from city a to city B, stops for one hour to unload and load, and then returns to city A. It takes 16 hours. The time from city a to city B is 1.5 times that from city B to city A. the speed of going to city B is 12 kilometers slower than that of returning to city A. how many kilometers is the distance between city a and city B?
2. To build a road, it is 75 meters more than the original plan every day. It can be completed in 24 days, 4 days ahead of schedule. How long is the road?
3. The sum of seven continuous natural numbers is 140, of which the largest number is (), and the product of five continuous even numbers is 3840, of which the smallest number is ()
16-1 = 15 (hours), the time ratio of going to and returning is 3:2, the time spent is 15 * 3 / 5 = 9, then coming back is 15-9 = 6. Suppose the speed of going to is XKM, and the speed of coming back is (x + 12)
9x=(x+12)*6
9x=6x+72
3x=72
X = 24 * 9 = 216 (m)
2. Planned days: 24 + 4 = 28 (days)
(x + 75) * 24 = 28x, x = 450 * 28 = 12600 (m)
The first blank is (23) process: 140 divided by 7 to get 20,20 is the average, the seven numbers are: 17,18,19,20,21,22,23,
I don't know for the last time,
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