On two shelves of a bibliotnka of 218 books. Kogda with each of them took the equal number of books, tone 1 regiment there were 42 books, and on the second shelf of 116 books. How many books were on each shelf in the beginning?

313
42+ x +116+ x =218 the 2nd =218-116-42 X =60:2 X =30 On 30 books took 42+30=72 books from each shelf was on 1 oh to the shelf of 116+30=146 books was on the second shelf
43
Answer add