ширина дорожки х
ширина клумбы - а
длина - в
2(а+х+в+х)-2(а+в)=16
2а+2х+2в+2х-2а-2в=16
4х=16
х=16/4
х=4 ширина дорожки
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р=2(а+в)
Р=2(А+В)
2(А+В)-2(а+в)=16 разделим обе части на 2
А+В-а-в=8
(А-а)+(В-в)=8
так как ширина дорожки одинаковая то 8 следует разделить на 2
8/2=4 м ширина дорожки