The math teacher quickly asked the tenth math application question: "It takes 20 hours for A to enter a batch of accounting statements into the computer, and it takes 12 hours for B to complete it alone." Now A will do it alone for four hours, and the rest will be done by A and B together, how long will A and B work together? ”

Jiang Xiaobai quickly answered the tenth math application question: "The time for A and B to work together is six hours. ”

The math teacher quickly asked the eleventh math application question: "The sum of the three numbers A, B, and C is fifty-three, so do you know that the ratio of number A to number B is four to three, and number C is two less than number B, and number B is?" What is the number C? ”

Jiang Xiaobai quickly answered the eleventh math application question: "B is 16.5, C is 14.5." ”

The math teacher quickly asked the twelfth math application question: "The length of a coarse candle is the same as that of a thin candle, a coarse candle can burn for five hours, a thin candle can burn for four hours, and the two candles are lit at the same time after a power outage, and they are extinguished at the same time after a call, and it turns out that the length of the coarse candle is four times the length of the thin candle, how long is the power outage?" ”

Jiang Xiaobai quickly answered the twelfth math application question: "Fifteen quarters of an hour." ”

The math teacher quickly asked the thirteenth math application question: "A three-digit number, the number in the hundred digit is one greater than the number in the tenth place, and the number in the single digit is two times less than three times the number in the tenth place, if the order of the three numbers is reversed, the sum of the three digits and the original three digits is one thousand one hundred and seventy-one, find this three-digit number." ”

Jiang Xiaobai quickly answered the thirteenth math application question: "This three-digit number is four hundred and thirty-seven. ”

The math teacher quickly asked the fourteenth math application question: "The three classes in the first grade donated books to Hope Primary School, the first class donated 152 books, the number of books donated by the second class is the average of the three classes, and the number of books donated by the third class is 40% of the total number of books donated by the grade, how many books did the three classes donate?" ”

Jiang Xiaobai quickly answered the fourteenth math application question: "A total of 570 books were donated." ”

The math teacher quickly asked the fifteenth math application question: "A, B, the two places are 31 kilometers apart, A rides a bicycle from A to B, and B also goes from A to B on a motorcycle an hour later, and it is known that A travels 12 kilometers per hour and B travels 28 kilometers per hour, and asks B how many hours after setting off to catch up with A." ”

Jiang Xiaobai quickly answered the fifteenth math application question: "Forty-five minutes." ”

The mathematics teacher quickly asked the sixteenth mathematics application question: "In order to save energy, a unit charges a monthly electricity fee according to the following regulations, and the electricity consumption does not exceed 140 kWh, and it is charged at 0.43 yuan per kWh. If it exceeds 140 degrees, the excess part will be charged at 0.57 yuan per degree. If the average electricity bill of an electricity consumer in April is 0.5 yuan per kilowatt-hour, how much should the electricity consumer pay in April? ”

Jiang Xiaobai quickly answered the sixteenth math application question: "One hundred and forty yuan." ”

The math teacher quickly asked the seventeenth math application question: "The ratio of the number of delivery personnel to the sales staff in the home appliance department of a large shopping mall is one to eight. This summer, due to the obvious increase in the purchase of household appliances, the manager of the household appliance department transferred 22 people from the sales staff to deliver goods. As a result, the ratio of delivery people to sales is two to five. How many delivery personnel and sales staff were there in the home appliance department of this shopping mall? ”

Jiang Xiaobai quickly answered the seventeenth math application question: "The home appliance department of this shopping mall originally had fourteen delivery personnel and one hundred and twelve sales personnel. ”

The math teacher quickly asked the eighteenth math application question: "If the price of a product is reduced by 10%, in order to keep the sales amount unchanged, how much more will the sales volume increase than when it was sold at the original price?" ”

Jiang Xiaobai quickly answered the eighteenth math application question: "The sales volume should increase by 11.11 percent compared with the original price." ”

The mathematics teacher quickly asked the nineteenth math application question: "The sum of the original unit prices of the two commodities A and B is 100 yuan, due to market changes, the price of commodity A is reduced by 10%, the price of commodity B is increased by 5%, and the unit price of the two commodities is increased by 2% compared with the original unit price after the price adjustment, and the original unit price of the two commodities A and B is what is the original unit price." ”

Jiang Xiaobai quickly answered the nineteenth math application question: "Twenty yuan for A, eighty yuan for B." ”

The math teacher quickly asked the twentieth math application question: "A rides a bicycle from A to B, and B rides a bicycle from B to A, both of them are moving at an average speed, so that they start at 8 a.m. at the same time, and by 10 a.m., they are still 36 kilometers apart, and at 12 noon, they are 36 kilometers apart, find the distance between A and B?" ”

Jiang Xiaobai quickly answered the twentieth math application question: "The distance between A and B is 288 kilometers. ”

The math teacher quickly asked the twenty-first math application question: "The length of the two trains A and B is 180 meters, if the two trains are running opposite each other, it will take a total of 12 seconds from the front of the train to the rear of the car." If driving in the same direction, it takes 60 seconds from the front of car A to meet the tail of car B, and it takes 60 seconds for car A to exceed the front of car B, and the speed of car A and car B remains the same. ”

Jiang Xiaobai quickly answered the twenty-first math application question: "That is, the speed of car A is 18 meters per second, and the speed of car B is 12 meters per second." ”

The math teacher quickly asked the twenty-second math application question: "The carrying capacity of a cargo ship is 400 tons, and the volume is 860 cubic meters, and now it has to carry two kinds of goods, pig iron and cotton, the volume of pig iron per ton is 0.3 cubic meters, and the volume of cotton per ton is 4 cubic meters." How many tons of pig iron and cotton are loaded to make the most of the ship's carrying capacity and volume? ”

Jiang Xiaobai quickly answered the twenty-second math application question: "Two hundred tons of iron and two hundred tons of cotton." ”

The mathematics teacher quickly asked the twenty-third math application question: "A computer company sold two kinds of computers, A and B, and sold a total of 2,000 units the year before last, and last year the number of computers sold in type A was 6 percent more than that of the year before, and the number of computers sold in type B decreased by 5 percent compared with the year before, and the total sales of the two types of computers increased by 110 units." How many computers were sold in each of A and B the year before last? ”

Jiang Xiaobai quickly answered the twenty-third math application question: "There are 2,000 computers in A and 200 computers in B." ”

The math teacher quickly asked the twenty-fourth math application question: "The surface area of the earth is about 71/29 times the land area, and the surface area of the earth is about 5.1 billion square kilometers. ”。

Jiang Xiaobai quickly answered the twenty-fourth mathematical application question: "The area of the land is 150 million square kilometers. ”

The students in the class all looked at Jiang Xiaobai dumbfounded at this time, and the math teacher's forehead was already sweating profusely at this time.