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Don't use equations to solve every problem~ one (1) The original price of water for residents in a city is 1.5 yuan per cubic meter, which has been increased by 20%. How much is the price per cubic meter after the price increase? (2) After a 20% increase in the price of water for residents in a city, the price per cubic meter is 1.8 yuan. What is the price per cubic meter before the price increase? 2. At the time of the fifth census, the population of the mainland of China was about 1.27 billion, of which the Han nationality accounted for 91.6%. How many billion ethnic minorities are there in the mainland of China? 3. Brass is an alloy of copper and zinc, in which the content of copper is 68%. A piece of brass contains 16 kg of zinc. How many kg does this brass weigh?
1: 1.5 * (1 + 20%) = 1.8, 1.8 / (1 + 20%) = 1.5, 2:12.7 * (1-91.6%) = 106.68, 3:16 / (1-68%) = 50
Xiao Ming has 30 pages left after reading a quarter of a book. How many pages are there in this book?
A barrel of oil weighs 20 kg. After 1 / 3 of the oil is poured out, the barrel weighs 14 kg. How many kg does this barrel weigh?
1. 30 (1-1 / 4) = 40 (page)
2. 20 - (20-14) △ 1 / 3 = 2 (kg)
A batch of cement was transported 54 tons in the first day, 9 tons less than 2 / 5 of the total tons in the second day, and 65% of the total tons in two times. How many tons of this batch of cement?
Cut a 9 cm high cone block into two parts with the same shape and size along the diameter of the bottom surface, and the surface area will increase by 72 square centimeters. What is the volume of the original cone block?
After the cone is cut, the part with increased surface area is actually two triangles. You can find a plasticine to cut it. The bottom of the triangle is the diameter of the cone bottom, and the height is the height of the cone. If the known height is 9 cm, you can know that the actual diameter is 72 / 2 * 2 / 9 = 8. Divide by 2 because there are two more triangles, multiply by
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- 5. Several primary school mathematics application problems, help to solve 1. The length of a wall clock's hand is 20 cm. How many cm does the tip of the hand walk in a day and night? 2. The diameter of a round flower bed is 3 meters. A circle of railings is set 0.8 meters away from the flower bed. How many meters is the total length of the railings? 3. The circumference of a piece of square paper is 20 decimeters. Cut it into the largest circle. How many decimeters is the circumference of this circle? 4. The express train from a to B runs in 8 hours, and the local train from B to a runs in 12 hours. The two trains run from a and B at the same time. On the way, the two trains meet and continue to move forward. After 6 hours, the distance between the two trains is 90 kilometers. How many meters is the distance between a and B? Want arithmetic solution, don't equation solution, also want to explain, trouble, online, etc., will add reward, hurry up
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- 8. If a round table can be made of 5 cubic meters of wood, then the table can be made of 1 cubic meter of wood and 5 legs For example, please list the equation of one dollar
- 9. A student desk consists of a desk top and four legs. If one cubic meter of wood can produce 50 desks or 300 legs, there are 15 cubic meters of wood, Make them match (equation of first degree with one variable)
- 10. A student desk consists of one desk top and four legs. If one cubic meter can make 50 desks or 300 legs, there are 15 cubic meters of wood, Please design how much wood to use for the table top and how much wood to use for the table legs
- 11. The school library has purchased three kinds of books, among which the number of story books accounts for 1 / 3 of the total number, 150 comic books, and the ratio of the number of science and technology books to the total number of the other two books is 1:5. How many of the three kinds of books have been purchased?
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- 14. It takes 40 seconds for a train to cross the 530 meter cave and 30 seconds for a train to cross the 380 meter bridge at the same speed What's the speed of this train? How long is its body?
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