New books were purchased for the library. Five-eighths were professional books, one-fifth were encyclopedias, and 231 books were dictionaries. How many professional books were there?

Correct result:

o =  825


 5/8n+n/5+231=n  5/8 n+n/5+231=n  7n=9240  n=1320   o=5/8 n=5/8 1320=825

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