Two numbers are called reciprocal numbers if they contain the same digits but are arranged in opposite order. Such as: 56 and 65, 123 and 321. Xiao Hua's weight and Xiao Hei's weight are exactly a pair of reciprocal numbers. The sum of the weight of the two is 77kg. Xiao Hei is heavier than Xiao Hua. The difference in weight between the two is not more than 10 kg. What is Xiao Hua's weight in kg?
如果两个数含有的数字相同，且排列顺序恰好相反，就将这两个数称为互反数．如：56和65，123和321．小花的体重数和小黑的体重数恰好是一对互反数，两人体重之和是77kg，小黑比小花重，两人体重之差不超过10千克，小花的体重为多少kg．
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