There is a batch of goods at the wharf, which are used six times less by trucks with a deadweight of 15 tons than by trucks with a deadweight of 10 tons. How many tons are there in total?

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• 1. A and B two cars from AB two opposite, after a few hours meet, meet, according to the original speed, 5 hours later B to a, a super B 45 How many kilometers per hour does a travel?
• 2. The total weight of the two baskets of apples is 93 kg, one fourth of which is 15 kg more than one seventh of that of the second basket. How many kg do the two baskets weigh? I want to solve the problem and the answer, to check the right line, a good answer, I give you points! Pay attention! I don't want X and y to solve this problem, because we haven't learned how to use y to solve it! The way we do these problems is to regard the whole as 1. Please learn from me to do this problem!
• 3. If the speed of a car from city a to city B is increased by 20%, it can arrive at city B one hour earlier than the original time; if the speed is increased by 30% after driving 100 km at the original speed, it can arrive at city B one hour earlier than the original time______ Kilometers
• 4. Both a and B cars run at a constant speed on the straight road. The speed of a car is 1.5 times that of B car. The distance of a car is only 2 / 3 of that of B car They say that some time is better than others?
• 5. When the plane flies between cities a and B, the downwind speed is a kilometer per hour, and the upwind speed is B kilometer per hour, then the wind speed is a kilometer per hour______ Kilometers
• 6. The two cars run from east to west at the same time. Car a runs 56 kilometers per hour, and car B runs 48 kilometers per hour. They meet after 4 hours How many kilometers apart?
• 7. A cement plant plans to produce 800 tons of cement per month, but actually 950 tons of cement per month, which is several percent higher than the original plan
• 8. If the number of people in each row is the same, how many people are there at most? How many rows are there for men and women? There are 36 girls and 48 boys If the number of people in each row is the same, how many people are there at most? How many rows are there for men and women? There are 36 girls and 48 boys
• 9. The number of male workers in a workshop is 2 / 3 of the number of female workers. The number of female workers is a few percent of the number of male workers, and the number of female workers accounts for a few percent of the number of the whole workshop
• 10. Among the students reading in the reading room, there were 15 more boys than girls. Later, the number of boys decreased by two fifths and that of girls by one fifth. The number of the remaining boys and girls was equal. How many students were reading in the reading room? [equation solution]
• 11. 6, a and B two cement heap, originally a pile of cement is 5/7 of B pile, if the 6 piles of piles from the B pile to a pile, a pile of cement is the 4/5 of the pile.
• 12. A and B start from ab at the same time and run in opposite directions. They meet at 80km away from the midpoint. The speed ratio of a and B is 4:5, and the distance between AB and B is calculated?
• 13. F (x + 2) = 3x square + 2x-1, find f (x-1) Please give me an answer
• 14. F (2x-1) = x square-3x + 1 to solve? I'm in a hurry. I will. Speed
• 15. ﹙2x+5﹚2+﹙x-1﹚﹙3-x﹚-﹙x+4﹚﹙2-3x﹚
• 16. Given f (x 2) = 3x ^ 2-2x 1, find the analytic expression of F (x)
• 17. If f (2x + 1) = x ^ 2 + 3x + 1, then the analytic expression of F (x) is?
• 18. Find the definition and range of the following function y = (3-2 ^ x) / (2 ^ x-1)
• 19. If the domain of the function y = 3 / (1-x) is known to be (negative infinity, 1] u [4,7), then the domain of the function is I don't understand at all
• 20. Given the function f (x) = sin (x + π / 6), where x ∈ [- π / 3, a], if the range of F (x) is [- 1 / 2,1], then the range of a is