Answer: (if that's the question?)
SARAH:: 2 rocks
CAMILLA:: 6 rocks
ZACHARY:: 24 rocks
Step-by-step explanation:
If Sarah has 2 rocks and Camilla has 3 times as many, then Camilla has 6 rocks because 2*3= 6
And if Camilla has 6 rocks while Zachary has four times as many as Camilla, then Zachary has 24 rocks because 6*4= 24
(hope this helps :)