1. A store went to the apple producing area to buy apples, and the purchase price was 1.20 yuan per kilogram. The distance from the place of origin to the store is 400 kilometers, and the freight is 65438+ 0.50 yuan per ton of goods. If the store wants to achieve a profit of 25% without considering the loss, what should be the retail price of apples per kilogram?
2.a container contains a certain amount of sugar, and B container contains several kilograms of water. First, take out 8 kilograms of sugar from container A and put it into container B. After stirring evenly, pour 30 kilograms of sugar water from container B into container A. After uniform stirring, the mass fraction of sugar water in container A is 40%, and that in container B is 20%. How many grams of sugar are there in a container?
A group of lawn mowers have to mow two grasslands, the big one is twice as big as the small one. All the players mowed a large lawn for a long time. In the afternoon, they divided it into two halves, half of which was left on the big lawn, and the other half was cut on the grass at night, leaving a small piece at night. This small piece was cut by 1 person, and it was cut in just one day. How many people are there in this group?
4. There is a barrel of gasoline, which was taken out for the first time 12kg, and the rest was taken out for the second time, and the whole barrel of oil was taken out for the third time, just taken out. How many kilograms did you take out for the second time?
5. There is a bag of Chinese herbal medicines, weighing 170g, and the medicine poured out for the first time is 3g, which is less than half of the original medicine; The medicine poured out for the second time is 2 grams more than the medicine left in the first time. At this time, the remaining medicine weighs 34 grams. How many grams of Chinese herbal medicine are there?
6. Haidian Bookstore's "Nine Chapters Mathematics Bookstore" offers preferential treatment to customers. Anyone who buys more than 65,438+000 copies of the same book will get 90% of the book price. A school went to the bookstore and bought two kinds of books, A and B, among which the number of books in B is the number of books in A, and only the books in A get a 10% discount. At this point, the total amount paid for buying a book is twice the total amount paid for buying a book. Given the price of book B 1.5 yuan, how much is book A?
7. A store sold a batch of goods at a reduced price during the exhibition. If you sell it after deducting 10%, you can make a profit of 2 15 yuan; If 20% of the price is deducted from the sales, the loss will be 125 yuan. What is the purchase price of this commodity?
8. There are three pipes, A, B and C. The pipe A flows out the salt water with 20% salt at a flow rate of 4g per second, the pipe B flows out the salt water with 15% salt at a flow rate of 6g per second and the pipe C flows out the water at a flow rate of 10g per second. C tube starts to stop flowing for 2 seconds after opening, and then flows for 5 seconds; Then stop for 2 seconds, then flow for 5 seconds ... Three pipes are opened at the same time, and all are closed after 1 minute. What is the percentage of salt in the mixed solution obtained at this time?
9. A, B, C and D in the picture below are water tanks, and A, B, C, D, E, F, G and H are water pipes that can be switched on and off. The distribution ratio of each pipeline is also shown in the figure. For example, for the water flowing into A, the water flowing into C has an outflow distribution ratio of 3, and the water flowing into D has an outflow distribution ratio of 2, with no remaining water flowing into the water tanks of B and C respectively. B and C are the same (1). First, water pipes C, D, E, F, G and H are closed, and 200g of saline water with a mass fraction of 10% and 800g of saline water with a mass fraction of 5% are discharged from B respectively. What is the mass fraction of brine in cylinder A? (2) Then close water pipes A and B, and open water pipes C, D, E, F, G and H ... D How many grams of salt water are accumulated in the sink? How many grams of salt does it contain?
10, it takes three weeks and three days for three people to complete the task, and how many days does it take four people to complete the task?
1 1. For a project, it takes 6 days for Party A and Party B to cooperate, 9 days for Party B and Party C, and 15 days for Party A and Party C to cooperate. How many days does it take for three people to cooperate?
practise
1. There are 465 students in a school, of whom 20 are girls and several are boys.
2. Two kinds of food *** 100 Jin, with a total value of several yuan. Now, A reduces the price by 20% and B increases the price by 20%. The total value of two kinds of food decreased per kilogram of 9.6 yuan 140 yuan. How many kilograms are there in each of the two foods?
3. There is a vegetable field and a wheat field, including *** 13 hectares of vegetable field and wheat field, and *** 12 hectares of wheat field and vegetable field. How many hectares are there in vegetable fields and wheat fields?
A sporting goods store bought 100 football and 80 basketballs from the wholesale department, which cost 2800 yuan. At the time of retail, the price of every football and basketball was raised. After all sold out, the income of * * * is 3020 yuan. How much is a football and a basketball?
When a store sells at a fixed price, each store can make a profit in 50 yuan. If 10 is sold at a price of 50%, it is equivalent to reducing the profit of 12 sold in 30 yuan. What's the price of this commodity per unit?
6. Container A contains 1 1 liter of pure alcohol and container B contains 15 liter of water. Pour part of pure alcohol in container A into container B for the first time to mix alcohol with water. For the second time, part of the mixed solution in container B is poured into container A. In this way, the pure alcohol content in container A is 62.5%, and the pure alcohol content in container B is 25%. How many liters of mixed liquid are poured into container A from container B for the second time?
7. A school selected 12 male and female teachers to participate in the radio exercise competition. The ratio of the remaining male teachers to the remaining female teachers is 2: 65,438+0. It is understood that this school has 156 teachers. How many male and female teachers are there in this school?
8. There are two cups, A and B. A contains water and B contains juice. First, pour the water in cup A into cup B, so that the liquid in cup B is doubled and stirred evenly. Then pour the juice from the second cup into the first cup, so that the liquid in the first cup is doubled and mixed evenly; ....., so five times, how much is the last glass of juice?
9. Put a bunch of balls in four boxes, including box A and box B. The balls in box C account for 75% of the total balls in boxes A and B, and there is 10 in box D.. How many balls are there in this pile?
10. Today, there are three piles of chess pieces, A, B and C. First, divide one pile of chess pieces into the other two piles, so that the number of chess pieces in these two piles will double. Distribute the B pile of chess pieces again, and finally distribute the C pile of chess pieces again. Results The pieces in pile A accounted for 80% of the pieces in pile C, and those in pile B accounted for 1 of the pieces in pile C.. How many points did each of the three piles of chess pieces occupy?