5
a fifteen year old should be able to do atleast 110 sit ups in two minutes.
as many as he/she can, or as many as you teach her/him
A 5-year-old should be able to count up to at least 20, but many children can count higher with practice and support from adults.
100
10
all five do it
How many sit ups should a 12 year old be able to do
Any where between 25-100.
A 12 year old should be able to do around 25 pushups in 30 seconds. This is a reasonable answer. Hope I helped you!
10-30
At least a year
A 4-year-old child should typically be able to count up to 10 or 20, but some may be able to count higher with practice and support from adults.