A unit plans to load trees on both sides of the two roads leading to the two competition venues. Now it has transported back a batch of seedlings. It is known that the length of one road is more than 6000 meters longer than that of the other road. If one tree is planted every 4 meters, it will be 2754 less. If one tree is planted every 5 meters, it will be 396 more. How many seedlings are there? (I know this question is very simple, Could you tell me the basic idea and method of doing this problem

If the length of the short circuit is l m, the length of the other road is 2L + 6000 M
（L/4+1）*2+[（2L+6000）/4+1]*2-（L/5+1）*2-[（2L+6000）/5+1]*2=2754+396=3150
The solution is: l = 40000 M
The total number of saplings is (40000 / 4 + 1) * 2 + (86000 / 4 + 1) * 2-2754 = 63004 - 2754 = 60240

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