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" There is a number consisting of two digits, which is equal to four times the sum of those digits; and if 18 be added to it, the digits will be inverted. What is the number? "
An Elementary Treatise on Algebra, Theoretical and Practical: With Attempts ... - Page 75
by John Radford Young - 1839
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An Elementary Treatise on Algebra, Theoretical and Practical: With Attempts ...

John Radford Young - Algebra - 1832 - 410 pages
...the number of half guineas : how many were there of each ? • Ans. 16 half guineas and 24 crowns. 7. There is a number consisting of two digits, which...equal to four times the sum of those digits ; and if 18 be added to it, the digits will be inverted : what is the number ? Ans. 24. 8. A man Ъе^ asked...
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Elements of Algebra

William Smyth - Algebra - 1833 - 288 pages
...which he pays, by $310. What are the two rates of interest ? Ans. 6 and 5 per cent. respectively. 17. There is a number consisting of two digits, which...equal to four times the sum of those digits ; and if 18 be added to it, the digits will be inverted. What is the number ? Ans. 24. 18. To find a fraction...
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Elements of Algebra

William Smyth - Algebra - 1836 - 292 pages
...which he pays, by $310. What are the two rates of interest ? Ans. 6 and 5 per cent. respectively. 17. There is a number consisting of two digits, which is equal to four limes the sum of those digits ; and if 18 be added to it, the digits will be inverted. What is the...
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An Elementary Treatise on Algebra, Theoretical and Practical: With Attempts ...

John Radford Young - Algebra - 1838 - 358 pages
............. 41 6t/ = 3744 •-. У = VrV — 9 = no. of crowns paid away, whence x( = ) = 12 = no. of guineas .-.he had at first 21 guineas and 21 crowns. QUESTION...inverted. What is the number ? Put x =. the first digit, y = the second ; then the number is 10x + y = 4x + 4y also 20x + 2y — 9 = 1Oy + x' from the first...
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The elements of algebra

James Wood - Algebra - 1841 - 496 pages
...if the number, consisting of the last 3 digits in order, be divisible by 8. 12. There is a certain number consisting of two digits, which is equal to four times the sum of its digits ; and if to the number 18 be added, the digits will be reversed. 13. The two digits of which...
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The principles of arithmetic. [Followed by] The principles of algebra

Wales Christopher Hotson - 1842 - 306 pages
...the price of a share in the steam-boat speculation was (6) A certain number consisting of two digits is equal to four times the sum of those digits; and if 12 be subtracted from twice the number, the digits will be inverted. What is the number ? Let x and...
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The elements of algebra

James Wood - Algebra - 1845 - 442 pages
...sum is expressed by the same digits reversed. What is the number? Ans. 26. 40. Find a number composed of two digits, which is equal to four times the sum of the digits, and such that, by reversing the digits, a number is formed equal to seven times that sum....
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A Treatise on the Elements of Algebra

James Bryce - 1846 - 350 pages
...Hence, we easily find the number of men to be 2150; and the numbers in the two sides, 46 and 47. 8. There is a number consisting of two digits, which...from twice the number, the digits will be inverted. Required the number. Let the digits be x and y : then the number is 10#+;/, and the number inverted...
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An introduction to algebra, and to the solution of numerical equations

John Radford Young - 1851 - 266 pages
...4ж=у+4, and 4ж-f- J2=3у; .-. 4ж — y= 4 x— 3y=— 12 =3 ; consequently the fraction is -|. (3) There is a number consisting of two digits which is equal to six times the sum of those digits, and if the number be diminished by 9, the digits will be inverted...
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An Elementary Treatise on Algebra, Theoretical and Practical

John Radford Young - 1857 - 322 pages
...— VrV = 9 = no. of crowns naid away, . 249—21. , , whence x( = — ) — 12 = no. of guineas ; .-.he had at first 21 guineas and 21 crowns. QUESTION...those digits ; and, if 9 be subtracted from twice 'he number, the digits will be inverted. What is the number ] Put x = the first digit, у = the second...
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