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① 100 kg rapeseed can extract 42 kg oil, 1 kg rapeseed can extract how many kg oil?
② Xiao Ming finished reading a book in a week. What percentage of the book does he read every day?
① 100 kg rapeseed can extract 42 kg oil, 1 kg rapeseed can extract how many kg oil?
② Xiao Ming finished reading a book in a week. What percentage of the book does he read every day?
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