The Arithmetical Expositor: Or, a Treatise On the Theory And Practice of ...
The Arithmetical Expositor: Or, a Treatise On the Theory And Practice of ...
Lewis, Enoch, 1776-1856
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Ans. The former $1400^ the latter $1200. 11. If A can mow an acre of grass in dfhrs.y and B. can mow Ij acres in 9ihrs., in what time can they jointly cut 8i acres? Ans. 22thr8. 12. How many pounds of quick lime must be thrown into a well containing 64^ cubic feet of carbonic acid gas,* to render it respirable; a cubic foot of that gas containing ^ of a pound of carbon, and lib. of lime being capable of absorbing |f of a pound of carbon ? Ans. 9|^lbs. 13. If a horse can draw 6i tons on a rail-r...oad which ascends 25| feet in a mile, what weight would he draw if the ascent was only 15| feet in a mile, the force required to move a given weight being as the ascent per mile ? Ans. 10|^. THE DOUBLE RULE OF THREE IN VULGAR FRACTIONS. RULE. State the questioti as directed page 69. Reduce the quantities as in the last rule. Invert the terms, in the first place, and multiply these terms thus inverted, and those in the second and third places continually together, for the answer sought; which will be of the same denomination as the third term.
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