Given that total number of principal dancers = 22
We have to find about how many dancers are in the apprentice company.
So let number of dancers in the apprentice company = x
Then half of the dancers in the apprentice company means x/2
Question says that "A ballet company uses all 22 of its principal dancers, plus 1/2 of its apprentice company in a large production" so that means there are 22+x/2 dancers.
Given that there are total 26 dancers so that means we get equation:
22+x/2=26
x/2=26-22
x/2=4
x=4*2
x=8
Hence final answer is that there are total 8 dancers in the apprentice company.