Fie a-distanta totala
a/4+18m=a
a/4+72/4=4a/4
a+72m=4a
4a-a=72m
3a=72m
a=72m:3
a=24m
Răspuns:
24 metri
Explicație pas cu pas:
[tex]0\,\noindent\rule{1cm}{0.4pt}\,\,x/4\,\,\underset{18\, m}{\underbrace{\noindent\rule{4cm}{0.4pt}}}\,\, x[/tex]
x - x/4 = 18 |·4
⇒ 4x - x = 72
⇒ 3x = 72
⇒ x = 72 : 3
⇒ x = 24 m
