79)
a+b+c=93 l a) |____|_|
a-3=b+3 b) |___|
c=b+3 c) |____|
-------------- ------------------------
a=?b=?c=? b+3+3+b+b+3=93
3b+9=93
3b=93-9
3b=84
b=84:3
b=28
a=28+3*2
a=28+6
a=34
c=28+3
c=31
34+28+31=93 l ( la inceput)
34-3=31
28+3=31
31=31=31 (a=b=c)
31+31+31=93 l ( dupa ce s-au mutat 3 litri din primul bidon in cel de al 2-lea)
80)
a+b=127 m a) |____|_|=>b:2+7
a-7=b:2 b) |____|____|=>2a-(7*2)
--------------- ----------------------
a=?b=? a+2a-7*2=127
3a-14=127
3a=127+14
3a=141
a=141:3
a=47
b=47*2-7*2
b=94-14
b=80
47-7=80:2
40=40
47+80=127 metri in total
47-7+80=
=40+80
=120 metri raman dupa ce s-au vandut 7 m din prima bucata
