A New System of Arithmetic: In Which Is Explained and Applied to Practical Purposes, in Addition to the Ordinary Rules of Operation, the Principle of Canceling, Being an Abbreviated Mode of Arithmetical Solution; Designed for Schools and Academies

Excerpt from A New System of Arithmetic: In Which Is Explained and Applied to Practical Purposes, in Addition to the Ordinary Rules of Operation, the Principle of Canceling, Being an Abbreviated Mode of Arithmetical Solution; Designed for Schools and Academies

If the fourth ratio be united, we obtain the time required, allowing each wall to be of the same thickness; thus.

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