Solving linear equation with one variable Wuhan plans to plant trees on one side of a certain section of the road. It requires one tree to be planted at both ends of the road. If one tree is planted every 5 meters, 21 seedlings will be missing. If one tree is planted every 6 meters, the seedlings will be used up. How many seedlings are there?

Solving linear equation with one variable Wuhan plans to plant trees on one side of a certain section of the road. It requires one tree to be planted at both ends of the road. If one tree is planted every 5 meters, 21 seedlings will be missing. If one tree is planted every 6 meters, the seedlings will be used up. How many seedlings are there?

Set X Original saplings
5×（x+21-1)=6×(x-1)
5x+100=6x-6
5x-6x=-6-100
-x=-106
x=106
Answer: original tree seedling 106

In a school sports meeting, there are 54 people in class two of three years to participate in the review. There are 6 people in each row of the review team. The distance between the rows is 1 meter. How long is the review team of this class?

The length of the inspection team of the class is (54 △ 6-1) × 1 = 8m

There are 60 square pools and fence poles. How many are there on the four feet? The distance between the two adjacent pools is 2 meters. How long is the pool side?

First question:
(60-4) / 4 = 56 / 4 = 14 (pieces)
14 + 2 = 16
Second question:
(16-1) * 2 = 15 * 2 = 30 (m)
A: there are 16 pools, 30 meters long?