A, B and C make a total of 940 parts at the same time. It takes 5 minutes for a to make one, 25% more than that for B, and 2 / 5 less than that for a, respectively I can answer this question, but I don't understand why B takes 5 / (1 + 25%) = 4 minutes more than 25% is not B, not 5-5x25%

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• 1. The quality of grain stored in warehouse A and warehouse B is equal. After 8 tons of grain is taken from warehouse A and put into warehouse B, the quality ratio of grain stored in warehouse A and warehouse B is 4:5? (please use proportion solution)
• 2. The experimental primary school held a group performance on campus. The ratio of the number of participants in grade 3, 4 and 5 was 2:5:3. It is known that the number of participants in grade 3 was 46. How many participants in grade 4 and 5? Although there is no point! But I hope you can have a warm heart! Please list the formula
• 3. Three. But please do it as soon as possible 1. The arc length of a sector is 4 π. Use it to make a side of a cone. Find the bottom radius of the side 2. In a circle O with a radius of 25 cm, the lengths of two parallel strings are 40 cm and 14 cm respectively. What is the distance between the two parallel strings? 3. A circle with a diameter of 24 cm. The maximum side length of an equilateral triangle that can be completely covered shall not exceed cm
• 4. The nine numbers 1, 2, 3, 4, 5, 6, 8, 12 and 24 are respectively filled in the small circle of the graph, so that the product of the multiplication of the three numbers of each line is equal 0-0-0 0-0-0 0-0-0 Nine circles up and down, left and right, cross, multiply three numbers, the product is all equal
• 5. What are the missing numbers in the brackets of series 0, 5, 8, 17, (), 37?
• 6. 11,12,13,16,17,20,25,24, () fill in a number in brackets to make it conform to the arrangement rule of the original sequence
• 7. Using 3,4, - 6, - 10, write three different formulas through mixed operation, so that the result is equal to 24
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• 9. A freight car and a passenger car leave from two places at the same time. After 4 hours' meeting, it takes 12 hours for the freight car to complete the whole journey, and how many hours for the passenger car to complete the whole journey? You can't just have the answer
• 10. A car drives from a to B at an average speed of 20 kilometers per hour. After arriving at B, it returns to a at a speed of 30 kilometers per hour A car drives from a to B at an average speed of 20 kilometers per hour. After arriving at B, it returns to a at a speed of 30 kilometers per hour. It takes 7.5 hours to get the distance between a and B. [the answer is 90 kilometers] [the process] [the equation of one yuan once] [thank you!]
• 11. 3 / 4 of the number a is equal to 6 / 5 of the number B. the number a is larger than the number B. if the number B is 18, the number a is ()
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• 14. Unfold the side wrapping paper of a cylindrical food can to get a square. The bottom radius of the cylindrical can is 5cm, and the height of the cylinder is 5cm______ (expressed in π)
• 15. The two right sides of a right triangle are 3cm and 5cm respectively. If the long side of the right triangle is taken as the axis and the short side is taken as the axis, a triangle can be obtained by rotating the triangle for one circle______ They are different in volume______ Cubic centimeter
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• 17. The two right sides of a right triangle are 6cm and 10cm long respectively. What shape and volume can be obtained by rotating the right side of 10cm as an axis for one circle What's the volume, the formula
• 18. The three sides of a right triangle are 6 cm, 8 cm and 10 cm long respectively. What shape can be obtained by rotating the two right sides for one circle? What's the maximum volume of it?
• 19. As shown in the figure, circle O is the circumscribed circle of triangle ABC  
• 20. It is known that in the triangle ABC, D is a point of BC, De is perpendicular to AB and DF is perpendicular to AC and F, and De is equal to DF. What is the relationship between AD and ef D is a point on BC. I have the wrong number