1, and the weight ratio of two packages of salt A and B is 4: 1. If 26 kg is taken out of the first package and put into the second package, the weight ratio of salt in package A and package B is 7: 5. What is the total weight ratio of two packs of salt? 2. There are 630 story books and science books in the school, and the ratio of story books to science books is 1: 4. I bought some story books. At this time, the ratio of story books to science books is 3: 7. How many story books do you buy? The school bought a batch of school tools, four fifths of which were distributed to the fifth and sixth grades at 2: 3, and there were 50 boxes left. How many boxes did you take in the sixth grade? 4. When processing a batch of parts, the ratio of the number of completed parts to the total number of parts is 1: 3. If 15 parts are processed again, the finished parts will be as many as the rest. How many parts are there in this batch? 5. A gunpowder is made of three raw materials: sulfur, charcoal and saltpeter. Their weight ratio is 2: 3: 15. Now prepare a batch of gunpowder, in which saltpeter is more than sulfur117kg. How many kilograms is this batch of gunpowder? How many kilograms are used for each of the three raw materials? 6. Students in Class A, Class B and Class C of Grade 6 135, and collect tree species 1 14kg. The proportion of the three classes is 8: 9: 10, and the weight ratio of the collected tree species is 4: 6: 9. How many people are there in each of the three classes? How many kilograms of tree species were collected? How many kilograms of tree species are collected on average in each class? 1. Both warehouses are cement, and the cement in warehouse A is 3/5 of that in warehouse B. After transferring 20 tons from warehouse B to warehouse A, the cement tonnage in warehouse A is 75% of that in warehouse B. How many tons is there in warehouse B?