Question

in 1936, germany constructed the hindenburg, an airship composed of a metal framework surrounding gas - filled bags. it needed to meet strict weight limits, so chairs were made of lightweight aluminum. designers wanted to fill the airship with helium, which doesnt burn. there was one issue, though. at the time, only the united states produced helium. americans feared germany would use the gas for military purposes, so they refused to sell it. engineers responded by redesigning the hindenburg to use flammable hydrogen - a dangerous mistake. in 1937, a hydrogen leak combined with a spark of static electricity, and the airship burst into flames.
match the problems with their solutions.
some furnishings were made of aluminum.
the hindenburg was redesigned.
problem
the hindenburg had strict weight limits.
the u.s. wouldnt sell helium to germany.
solution

Explanation:

• For the problem "The Hindenburg had strict weight limits", the text mentions "It needed to meet strict weight limits, so chairs were made of lightweight aluminum". So the solution "Some furnishings were made of aluminum" matches this problem.
• For the problem "The U.S. wouldn't sell helium to Germany", the text states "Americans feared Germany would use the gas for military purposes, so they refused to sell it. Engineers responded by redesigning the Hindenburg to use flammable hydrogen". So the solution "The Hindenburg was redesigned" matches this problem.

Answer:

• Problem: The Hindenburg had strict weight limits → Solution: Some furnishings were made of aluminum.
• Problem: The U.S. wouldn't sell helium to Germany → Solution: The Hindenburg was redesigned.