Предмет:
МатематикаАвтор:
piggyboyleбыло на второй полке х
было на первой полке х+ 0,2х
стало на первой полке х+0,2х-3
стало на второй полке х+3
составим уравнение
х+0,2х-3=х+3
0,2х=6
х=6:0,2
х=30 книг было на второй полке
30+(30*0,2)=36 книг лежало на первой полке
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