## Xiao Ming read a book. On the first day, he read 20% of the whole book. On the second day, he read 25% more than on the first day. On the third day, he read 12 pages, which is exactly half of the whole book

100% divided by 2 = 50% 50% - 20% - 25% = 5% 100% divided by 5 = 20% 12 times 20 = 240

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