Excuse me, I don't know how much tickets children need to buy for Yuntai Mountain tickets, but I can provide some other relevant information:
1. Adult ticket **60 yuan/Zhang * *.
2. Student ticket **40 yuan/Zhang * * (can be purchased with a valid student ID card).
3. Children's tickets are free (children under the height of 1.2 meters can enter the park free of charge).
4. Tickets for the elderly **40 yuan/Zhang * * (can be purchased with a valid senior citizen card).
5. Concession tickets **40 yuan/Zhang * * (can be purchased with relevant documents, including disability certificate, military officer's card, press card, etc. ).
The above information is for reference only, and the specific fare may vary due to factors such as scenic spots and policies. It is recommended that you consult the official information of the scenic spot before purchasing.