There are 4 tiers of seats in each section. Each tier is 4 times greater than the tier below. The first tier contains 4 seats. how many seats are in the second tier?
You just told us that "Each tier is 4 times greater than the tier below."
So if the first tier has 4 seats, then the second one has (4x 4) = 16 seats.
We didn't even need to know that there are 4 tiers of seats in the section.
A much more interesting question would be:
How many seats are there in the whole section ?