Xiaohua finished two fifths of a story book on the first day, nine tenths of it on the second and third days, and what percentage of the total on the second day Xiaohua read a story book. In the first two days, she read two fifths of a story book. In the second three days, she read nine tenths of a story book. In the second day, she read a few of the story books

Xiaohua finished two fifths of a story book on the first day, nine tenths of it on the second and third days, and what percentage of the total on the second day Xiaohua read a story book. In the first two days, she read two fifths of a story book. In the second three days, she read nine tenths of a story book. In the second day, she read a few of the story books

This question itself has some problems. It doesn't say that Xiaohua finished reading a story book in three days, so 2 / 5 + 9 / 10-1 = 3 / 10, and the next day at least 3 / 10