Răspuns:
60·[(1,2)⁶:(1,2)⁰:(1,2)⁴-0,9]+114,6=
60·[(1,2)⁶⁻⁰⁻⁴-0,9]+114,6=
60·[(1,2)²-0,9]+114,6=
60·(1,44-0,9)+114,6=
60·0,54+114,6=
32,4+114,6=147
a=147 ferestre
_____________
a=ferestre deschise;b=ferestre inchise
a+b=147
b=a/6=>a=6b
6b+b=147
7b=147=>b=147:7=>b=21 ferestre inchise
a=6·21=126 ferestre deschise
