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標題:
F. 2 maths;
發問:
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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;]!
最佳解答:
Let the original number be AB A + 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
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