虽然我是读中文的，但是我对这道题很感兴趣的。
翻译：如果一个人X年前是Y岁，那么1年之前他确切是多少岁？
分析：这道题很简单的。X年前是Y岁，那么现在就是（X+Y）岁；现在是（X+Y）岁，而1年前就是[（X+Y）-1]岁。
应该是这样的吧。呵呵~~~~~~
How old was a person exactly 1 year ago if exactly X years a
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