The sum of the dights of a two-dight number is 8. If the dights are reversed, the value of the number is decreased by 54. What is the original number?
吾該晒;]!
F. 2 maths;
2009-11-12 4:50 am
回答 (1)
2009-11-12 4:55 am
✔ 最佳答案
Let the original number be ABA + B = 8 ... (1)
Its value is 10A + B
After reversed, its value is 10B + A
(10A + B) - (10B + A) = 54
9A - 9B = 54
A - B = 6 ... (2)
(1) + (2) => 2A = 14 => A = 7
A = 7 => B = 1
The original number is 71
收錄日期: 2021-04-23 23:19:58
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https://hk.answers.yahoo.com/question/index?qid=20091111000051KK01467