The cost of a birthday present was shared between Benjamin and Christopher. At first, Benjamin paid of what Christopher paid. When Benjamin paid $50 4. more, he ended up paying of what Christopher paid. How much was the cost of the present?

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A: Note that, the LHS is equal to the RHS.

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Estimation

A new framework of data analysis where the new statistical methods are used for interpreting the results and analyzing the data is known as estimation in statistics.