Answer: Kai picked 858 blueberries and Nico picked 78 blueberries.
Step-by-step explanation: Given that Kai picked 11 times as many blueberries as Nico and together they picked 936 blueberries.
We are to find the number of blueberries that Kai and Nico picked.
Let x and y represents the number of blueberries that Kai and Nico picked respectively.
Then, according to the given information, we have

Substituting the value of x from equation (i) in equation (ii), we get

And, from equation (i), we get

Thus, Kai picked 858 blueberries and Nico picked 78 blueberries.