book Maths Puzzle Numerical Ability

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What U.S. President has a unique proof of the pythagoream theorem?

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book Other Question

I have problems converting word problems into linear equations, could you please help me with this one?
1. America creates more garbage than any other nation. According to Denis H I need a fast and easy way to understand how to solve expressions with variables using subtiution, so could you please give me examples and if possible help me understand these types of problems better.