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 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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