Let the number be 10x + y. Then x + y = 15 and (10y + x) − (10x + y) = 9, which simplifies to y − x = 1. Adding both equations gives 2y = 16, so y ...
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Let the number be 10x + y. Then x + y = 15 and (10y + x) − (10x + y) = 9, which simplifies to y − x = 1. Adding both equations gives 2y = 16, so y ...