Answer : The pints of blueberries Sarah and her friends eat, 
Step-by-step explanation :
As we are given that:
Sarah and her friends picked pints of blueberries = 
Let us assume that they ate number of the blueberries be, 'x'
Remaining blueberries sarah and her friends eat = 
We are given that Remaining blueberries sarah and her friends eat = 
So,




Thus, the pints of blueberries Sarah and her friends eat, 