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as many as he/she can, or as many as you teach her/him
5
a fifteen year old should be able to do atleast 110 sit ups in two minutes.
100
10
all five do it
Any where between 25-100.
10-30
A 12 year old should be able to do around 25 pushups in 30 seconds. This is a reasonable answer. Hope I helped you!
How many sit ups should a 12 year old be able to do
At least a year
Three-year-olds should be able to climb up and down stairs, walk and run, be able to hold a crayon, and use the toilet. He/she should also be able to talk. e.g. "Give me!" or at least a short sentence.