A batch of parts will be processed by Party A at 9:00 and Party B at 6:00. Now, when the two people cooperate, Party A has finished 72 parts. How many parts are there in total?

Hello, Yixue and Liyue, the solution is as follows: Title: processing a batch of parts, Party A completes it at 9:00 and Party B completes it at 6:00. Now the two work together. When completing the task, Party A has made 72 parts. How many parts are there in total? The time of cooperation between Party A and Party B: 1 / 9 (1 / 9 + 1 / 6) = 1 / 5 / 18 = 18 / 5 hours, the amount of work done by Party A: 1 / 9 × 18 / 5

A and B leave from ab respectively. B travels 10% of the whole journey every hour. A reaches the midpoint of AB 1 / 3 hours earlier than B. when B reaches the midpoint, a drives 195 kilometers to B. the distance between AB and B is calculated,

Car B runs 10% of the whole journey every hour, and it takes 1 / 10% = 10 (hours) for car B to complete the whole journey
The total distance of a car is (10 / 2-1 / 3) * 2 = 28 / 3 (hours)
When B reaches the midpoint, it takes 5 hours, and so does a
So the speed of a = 195 / (28 / 3-5) = 45 (km / h)
So the distance between ab = 45 * 28 / 3 = 420km

In the numbers of 0.705, "7" is in () and "5" is in ()
Simple operation: 574 + 598 / 13-137
（35+86）*（124-96）

Among the figures of 0.705, "7" is in the tenth and "5" is in the thousandth
574+598÷13-137
=46+574-137
=620-137
=483
（35+86）×（124-96）
=121×28
=3388
These MS are not easy to operate

1. Divide 2033 by Prime a, the quotient is a two digit number, the remainder is 35, what is prime a?
2. A three digit number is a, B and C. they are not equal to each other and are not 0. Use a, B and C to arrange six different three digit numbers. If the sum of the six three digit numbers is 2442, what is the largest of the six three digit numbers?
3. In case of water leakage, two pumps should be installed immediately to pump out water. At this time, 600 barrels of water will be leaked in. One pump pumps 18 barrels per minute, and the other pump pumps 14 barrels per minute. How many barrels of water will be leaked in 50 minutes? (answer in two ways)
4. A railway patrolman is working in the tunnel when he hears a train coming to the tunnel. He immediately looks at the road signs in the tunnel and knows that the distance between him and the tunnel entrance in the direction of the train is 3 / 7 of the total length of the tunnel. According to his experience, no matter which way he runs at the fastest speed, when the train reaches him, it just leaves the tunnel, How many kilometers per hour does the patrolman run?
5. For a job, Party A and Party B cooperate and complete it in 12 days. Party A does it alone in one day and Party B does it alone in 3 days to complete 3 / 20. If Party B does it alone, how many days will it be completed?
6. Xinchang tea shop delivers a batch of first-class tea and second-class tea, of which the quantity of second-class tea is 1 / 2 of that of first-class tea. The purchase price of first-class tea is 24.8 yuan, and the purchase price of second-class tea is 16 yuan. Now it is sold according to the purchase price plus 12.5%. When all the second-class tea is sold out and the first-class tea remains 1 / 3, the total profit is 460 yuan. How many kilos of first-class tea are imported?
7. Make a 5cm high open box with a 30cm long and 20cm wide rectangular sheet iron
(a) Draw a picture: how to cut the material, draw a picture and mark the data, calculate the volume of the box
(b) Can you make the volume of the box bigger with this sheet? If you can, please draw a second diagram

If we use 2033-35 to get 1998, and divide a into 1998, 1998 and 998, there is only one prime factor of 37 (1998 / 37 = 54), so a = 37; 2. If we use a, B and C to get six different three digits, then a, B and C occupy two times in the number, ten and hundred respectively, so the sum of these six digits = (100 × a + 10 × a + A + 100

A batch of parts will be processed by Party A at 9:00 and Party B at 6:00. Now, when the two people cooperate, Party A has finished 72 parts. How many parts are there in total?