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Fermi problems: Fermi challenge

This problem assumes that students have completed the ‘Moving Mount Fuji’ problem and is intended to be used as a competition. The problem consists of three separate short problems:
1. How many bricks are needed to build a house.
2. What is the value of change that can be fitted in a 5 litre bucket.
3. How many playgrounds could be built on an area as large as the combined area taken up by parking spaces in a city?
The mathematical background needed to solve the problems include calculating the area of a rectangle, working with volume, and area.

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