Teacher:You are given a passage. You need to construct a question about the information present in the passage. Construct a question in such a way that (i) it is unambiguous, (ii) its answer is the whole paragraph. Avoid creating questions that can be answered correctly without actually understanding the paragraph.
Teacher: Now, understand the problem? Solve this instance: It would definitely depend on the gas used. Some gases are heavier than air and would fall istead of rise. Consider also the pressure inside the ballon. It may rupture with the decrease in atmospheric pressure.
Too many variables to give you a proper answer.
Student:
How high can a gas filled balloon travel upward?