Final answer:
To determine how many cartons are needed to store 63 cubic feet of chicken feed, one can calculate that 3 cartons hold 9 cubic feet, so to store 63 cubic feet, the farmer would require 21 cartons.
Step-by-step explanation:
The question involves basic arithmetic and volume calculation. We are given that 3 cartons hold 9 cubic feet of space.
To find out how many cartons are needed to store 63 cubic feet,
we divide the total volume needed by the volume that 3 cartons can hold.
Step 1: Find out the volume that one carton can hold: 9 cubic feet / 3 cartons
= 3 cubic feet/carton.
Step 2: Calculate the number of cartons needed for 63 cubic feet: 63 cubic feet / 3 cubic feet/carton
= 21 cartons.
Therefore, the farmer needs 21 cartons to store a total of 63 cubic feet of chicken feed.