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Question:

There are 3 stools in the room and 4 chairs in 40. The room is just 40 children sitting on it. Legs, chairs, legs, children, the number of legs is 225

There are 3 stools in the room and 4 chairs in 40. The room is just 40 children sitting on it. Legs, chairs, legs, children, the number of legs is 225

Answer:

First of all, remove the total number of legs of 40 children, 225 minus 80, and the remaining 145, that is, a total of 40 legs of 3 legs, plus 4 legs of the leg chair is 145, can be calculated 3 legs stool is 15, four legs chair is 25.
If the stool, chair, kids, kids were standing, two legs up, and sat on the left leg, a total of 225-40X2=145, is the chairs and stools, chairs or stools are no matter, a total of 3 amputated leg, left 145-40X3=25, 3 legs of the stool are the board... So there are 25 chairs, 15 stools, typing very tired.

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