2. There is a pile of sand, which used half a ton for the first time, half a ton for the second time, half a ton for the second time and 6 tons for the third time. How many tons is this pile of sand?
3. The average weight of Kobayashi and Xiaoping is 33kg, that of Kobayashi and Xiao Qun is 33.5kg, that of Xiaoping and Xiao Qun is 34.5kg, and what is Kobayashi's weight?
A student walks from home to school for 2 minutes at a speed of 50 meters per minute. If he keeps walking like this, he will be eight minutes late. Later, he moved at a speed of 60 meters per minute. As a result, he arrived at school five minutes early. How far is this student's home from school?
Buses and trucks run in opposite directions from Party A and Party B at the same time. Buses travel 8 kilometers more than trucks per hour. After meeting in 3.5 hours, the bus is still 1 12 kilometers away from bilibili. How many kilometers are there between Party A and Party B?
6. Two cars, A and B, travel in opposite directions from two places 528 kilometers apart at the same time, and meet after 6 hours. Car A is 6 kilometers faster than car B every hour. How many kilometers do they drive per hour? (Equation solving)
7. The canteen of the cement plant has returned 3 tons of coal, and it is planned to burn for 20 days. After improving the furnace, this batch of coal actually burned for 25 days. How many kilograms of coal is actually saved than planned every day?
8. The school allocates student dormitories. If 6 people live in each room, then 20 people have no beds; If there are eight people in each room, it is just full. How many rooms are there in the student dormitory? (Equation solving)
9. As shown in the figure, how many square centimeters is the trapezoidal area?
10, there is a 40-meter-long rope. If this rope is used to enclose a right triangle on a piece of land near the wall, what is the maximum area of the enclosed right triangle? (Draw a schematic diagram before answering)
165438+
12, Shuguang Primary School bought new desks and chairs this semester, and bought 5 tables and 9 chairs, which cost 1040 yuan. It is known that a set of such desks and chairs costs 160 yuan. How much is each table and chair?
13, Xin Qiang bought 1 pen and 1 notebook * * from 3.6 yuan, and Wei Xiang bought the same 1 pen and four notebooks * * and spent 10.5 yuan. What is the unit price of pens and notebooks?
14. The charging standard for a parking lot is: (1) 1 hour 2.5 yuan. (2) If it exceeds 1 hour, 2.50 yuan will be charged for every 0.5 hour. Uncle Li paid 20 yuan in this parking lot. How many hours did Uncle Li park in this parking lot?
15. a ship sails from port a to port b with a planned speed of 20 kilometers per hour. In fact, its speed is 2.4 kilometers faster than planned. After 4.5 hours, there is still 1 1 km from Port B. What is the distance between the two ports AB?
16, the thief and the police ran up an escalator, 30 seconds apart. Thieves can take three steps per second, and police can take four steps per second. It is known that escalators have 150 steps and run at 1.5 steps per second. Can the police catch the thief on the escalator?