The GCF (Greatest Common Factor) is 6a.
Divide the actual building's measurements by the replica's measurements.

The measurements of the actual building are divided by
20 not 12.
The crew member's calculation is
incorrect.
Using inequality for the give interval which states that :
A function lies in an open interval from -2 to 6.
Hence,we can rewrite it as :
-2 < x < 6
1/2 divided by 3 is 1/6.
So your answer is 1/6 pounds each person.