A Complete System of Practical Arithmetic: (both Vulgar & Decimal) on an Entire New Plan ... To which is Added, a Large Collection of New Questions, with Only the Answers Thereto ...

W. Williams, 1773 - 488 σελίδες

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Σελίδα 314 - To be 100 feet from th' top to th' ground ; Against the wall a ladder stood upright, Of the same length the castle was in height : •A. waggish youngster did the ladder slide (The bottom of it) 10 feet from the side ; ' Now I would know how far the top did fall, By pulling out the ladder from the wall t A 6 ini nearly 26.
Σελίδα 208 - If 12 men, in 15 days, can- build a wall 30 feet long, 6 feet high, and 3 feet thick, when the days are 12 hours long ; in what time will 60 men build a wall 300 feet long, 8 feet high, and 6 feet thick, when they work only 8 hours a day ? Ans.
Σελίδα 103 - The silk-mill at Derby contains 26586 wheels, and 97746 movements, which wind off or throw 73726 yards of silk every time the great water-wheel, which gives motion to all the rest, goes about, which is three times in a minute.
Σελίδα 314 - A caftle Wall there was whofe height was found To be one hundred feet, from th' top to th' ground, Againft the wall, a ladder ftood upright, Of the fame length, the caftle was in height. A waggifh fellow did the ladder flide (The bottom of it) ten feet from the fide.
Σελίδα 457 - ... with 15 to 210, 2,730, 32,760 ; with 16 to 240, 3,360, 43,680; with 17 to 272, 4,080, 57,120; and with 18 to 306, 4,896, 73,440, which, adding these three together, made 78,642 changes in two at a time, three at a time, and four at a time, the number of flags, 18, being only two more than were carried by vessels then using Marryat's code.
Σελίδα 324 - Quere, the Number of Spots on all the bottom Cards ^ (5) What Dimensions must I give to a Joiner to make a Cubical Box that will hold 2000 Oranges of 2^ Inches Diameter each, supposing the Oranges globular, keeping that Form, and laid in Rows exactly at the Top of each other?
Σελίδα 390 - To change current money into banco, and banco into current money, say, as 1 00, with the agio added to it, is to 100, so is any given sum current money, to its value in banco. — And, as 100 is to 100 with the agio added to it.
Σελίδα 312 - Note. When all the periods of the given number are brought down and used, and more periods are required to be found, the operation may be continued by adding as many periods of ciphers as we please, namely, bringing always two ciphers at once to each dividend. And when the root is to "be extracted to a great number of places, the work may be much abbreviated thus : having proceeded in the extraction after the common method, till you have found one more than half the required number of figures in...
Σελίδα 67 - Body about 33905 Pounds of that fluid Matter ; and in foul Weather, when the Air is most light, but 30624 Pounds.
Σελίδα 103 - The question is, how many yards cf silk may be thrown by this machine in a day, reckoning ten hours to a day's work ? and how many in the...

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