In 3 sections of school library in educational art and popular scientific 10500 books textbooks make 2 fifth all books in the section of fiction 1.450 books bigger than textbooks how many books in the section and popular scientific literature?

114
2/5 - textbooks 2/5 + 1450 - it is thin. liter - nauch. - the priest. 10500 books - only 1) 10500 * 2/5 = 4200 - textbooks 2) 4200 + 1450 = 5650 - it is thin. liter 3) 10500 - 4200 - 5650 = 650 - nauch. priest. - answer.
335
Answer add