1. There is a section of highway with a length of 868 meters. How many seedlings does it take to plant a tree every 62 meters on both sides of the road? 2.46 students went boating, and * * * took 10 boats, including 6 big boats, 4 small boats, () big boats and () small boats. 3. Think of a two-digit number, divide it by the product of 12 and the sum of it and 12, which can be divisible without remainder. 4. Saw a wooden stick with a length of 10 meter, and it takes 2 minutes to saw each section. It will take () minutes if this stick is sawed into five equal parts. On Sunday, the fourth-grade students go to the "water park" to play. The following are the items provided by "Water Park" for students to play and their pricing: Item pricing: 8 yuan (four people in a boat) takes a speedboat for every two people, 6 yuan plays water polo once an hour, 2 yuan shoots water every hour, 3 yuan visits the aquarium every hour, 5 yuan swims every hour, and each student 10 yuan can play several different items. Please design several schemes for fun. 6. Twenty young pioneers collected160kg of apples. If each basket contains 20 kilograms, there are still two baskets missing. How many baskets are there? 7. The sum of dividend, divisor and quotient is 254, and the known quotient is 4. Can you find out what the dividend and divisor are? There are 808 students in the school, and they go for a spring outing in six cars. The first bus has already picked up 128 people. If the other five carriages carry the same number of passengers as the first carriage, there are () students in the last carriage. 9. A teacher took 276 students to the park to rent a boat, with a maximum of 50 people in a big boat and 30 people in a small boat. If fewer charterers are better, what is the most reasonable way to rent? 10, the known large number is four times the decimal number, and the difference between these two numbers is 39, so these two numbers are () and () respectively.