Răspuns :
x+y+z=508
x=y+19
y=z+57
z=y-57
y+19+y+y-57=508
3y=508+57-19
3y=546
y=182
x=182+19
x=201
z=182-57
z=125
x=y+19
y=z+57
z=y-57
y+19+y+y-57=508
3y=508+57-19
3y=546
y=182
x=182+19
x=201
z=182-57
z=125
a=suma banilor Andreei
m=suma banilor Mariei
e=suma banilor Elenei
a+m+e=508
a=19+m
m=57+e
a=19+57+e
19+57+e+57+e+e=508
133+3e=508
3e=508-133
3e=375
e=375:3
e=125
m=suma banilor Mariei
e=suma banilor Elenei
a+m+e=508
a=19+m
m=57+e
a=19+57+e
19+57+e+57+e+e=508
133+3e=508
3e=508-133
3e=375
e=375:3
e=125