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100的倍数
条件一,x<500,说明x的范围从[450,550)缩小到[450,500),y还是在[350,450)之间,所以x+y的范围在[800,950)之间,所以无法确定是最接近于800 还是900,不充分。
条件二 y<400,说明y的范围从[350,450)缩小到[350,400),x的范围为[450,550),所以x+y的范围为[800,950)之间,有800和900 无法确定,所以不充分
联立:x的范围为[450,500),y的范围为[350,400),x+y的范围为[800,900),还是有800和900两个值,无法确定,不充分。
所以,选E

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