I agree. I made the correct assumption of what they really meant though.
The balloon question was a bit arse too:
I will explain why in white so you have to select it to read it:
It was unclear to me if the balloons were supposed to be identical or not. I wrongly assumed that they were not, since they appeared to be in the same place. In fact it seems that they were at different altitudes.
I also didn't know the correct terms for some things.