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. About the Publisher Forgotten Books publishes hundreds of thousands of rare and classic books. Find more at www.forgottenbooks.com This book is a reproduction of an important historical work. Forgotten Books uses state-of-the-art technology to digitally reconstruct the work, preserving the original format whilst repairing imperfections present in the aged copy. In rare cases, an imperfection in the original, such as a blemish or missing page, may be replicated in our edition. We do, however, repair the vast majority of imperfections successfully; any imperfections that remain are intentionally left to preserve the state of such historical works.