Question
Mark had 5 times as many books as Jack. After Mark and Jack donated 70 books and 10 books away respectively, they were left with an equal number of books. How many books did Mark have at first?
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Mark had 5 times as many books as Jack. After Mark and Jack donated 70 books and 10 books away respectively, they were left with an equal number of books. How many books did Mark have at first?