The school organized the third grade students to visit the youth

1. According to the rule of one pass and ten pass, you are one pass, two in one minute, four in two minutes. 3 minutes is 8 people, so 2 ^ 5 = 32

2. 100 + 5 + 35 = 140 people, if there is more than one car, it can take 140 more people
140 ÷ 35-30) = 28 original cars
28 × 30 = 840 people
A: we plan to use 28 cars to 840 people

4. We rent x buses, < br > 28x + 13 = 32x-3 < br > 4x = 16 < br > x = 4 < br > 28 × 4 + 13 = 125 (people) < br > A: there are 125 third graders in this school, renting 4 buses

5. It took Xiao Ming x hours to meet the whole class after walking for an hour
7.5x-5 * 1 = 5 * 1 + 5x
7.5x-5x = 5 + 5
2.5x = 10
x = 4
the distance between the school and the children's palace is 5 * 1 + 5 * 4 + 2.5 = 27.5km

6. This spring outing starts at 6:00 and ends at 15:00.

7. Four buses, one taxi 4x30 = 120120 + 3O = 150 yuan

8. The school organized 98 students from grade three to attend the museum. The school ordered two cars first. If you want to take all the students away, each car should pull at least 45.

9. First, divide 115 by 5 equals 23 yuan, 115 minus 23 equals 92, 92 times 2 equals 184 yuan, you need to buy 23 tickets, you need 184 yuan

10. Unknown_Error