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How old is the child going to kindergarten? How many people are there in a big class?
Small nursing class: 2-2.5 years old, 25-30 years old.

Small class: three to three and a half years old, 35-40.

Middle class: four to four and a half years old, 40-45 years old

Big class: five to five and a half years old, 45-50.

Pre-school: 50 people aged five and a half to six or seven.

Supplement: I am a professional teacher in public kindergartens. I hope I can help you!