Library

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?

Result

o =  825

Solution:

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

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