 | John Bonnycastle - Algebra - 1813 - 456 pages
...daughter l6o/, 1 7- There is a certain number, consisting of two places of figures, which is equal to four times the sum of its digits; and if 18 be added to it the digits will be inverted; what is the number? «•', Ans. 24 18. A person being asked how many... | |
 | John Bonnycastle - Algebra - 1818 - 326 pages
...daughter 160/. 16. There is a certain number, consisting of two places of figures, which is equal to four times the sum of its digits ; and if 18 be added to it the digits will be inverted ; what is the number ? Ans. 24 17. Two persons, A and B, have both the.... | |
 | John Davidson, Robert Scott (writing master) - Arithmetic - 1818 - 190 pages
...stock was doubled : what sum did he begin trade with ? 7. Find a number, consisting of 2 digits, which is equal to 4 times the sum of its digits ; and if to the number 27 were added, the digits would be inverted. INVOLUTION, OR THE RAISING OF POWERS. A... | |
 | George G. Carey - Arithmetic - 1818 - 602 pages
...was doubkd. With what sum did he begin trade ? 7. Required a number, consisting of 2 digits, which is equal to 4 times the sum of its digits ; and, if to that number -7 were added, the digits would be inverted? INVOLUTION. INVOLUTION is the operation... | |
 | John Bonnycastle - Algebra - 1825 - 336 pages
...daughter 160Z. 16. There is a certain number, consisting of two places of figures which is equal to four times the sum of its digits ; and if 18 be added to it the digits will be inverted ; what is the number ? Ans. 24. 17. Two persons, A and B, have both the... | |
 | Michael Walsh - 1831 - 348 pages
...proportion, how much is each person's part of the cost ? 87. Required a number, consisting of 2 digits, which is equal to 4 times the sum of its digits ; and if to that number 27 were added, the digits would be inverted. ~: , . - . ! *,• »~, ' ,,.-s.- ..' ,... | |
 | Michael Walsh - Arithmetic - 1838 - 346 pages
...proportion, how much is each person's part of the cost ? 87. Required a number, consisting of 2 digits, which is equal to 4 times the sum of its digits ; and if to that number -.27 were added, the digits would be inverted. • \ ! • V j 1. 546 ... | |
 | Richard W. Green - Algebra - 1839 - 156 pages
...as 5 to 4 ? Ans. 8 and 12. 4. There is a certain number, consisting of two places of figures, which is equal to 4 times the sum of its digits ; and if 18 be added to it, the digits will be inverted. What is that number 1 Let x= first digit or tens ; and y= the units. 10a;+y=... | |
 | Samuel Alsop - Algebra - 1848 - 336 pages
...40. There are two numbers in the ratio of 2 to 3, and their sum is to the sum of their squares as 5 to 78. What are they ? Ans. 12 and 18. Ex. 41. A certain...gone Щ times as far in steamboats as in stages, and -y as far in railroad cars as in steamboats. How many miles has he travelled in each of the three way's... | |
 | John Bonnycastle - Algebra - 1851 - 288 pages
...daughter 160Z. 16. There is a certain number, consisting of two places of figures, which is equal to four times the sum of its digits ; and if 18 be added to it, the digits will be inverted; what is the number? Ans. 24. 17. Two persons, A and B, have both the same... | |
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There is a certain number, consisting of two places of figures, which is equal to four times the sum of its digits ; and if 18 be added to it, the digits will be inverted; what is the number? Ans. 24. 
