Răspuns :
a+b+c=320;
a=5c;
b=2c;
5c+2c+c=320;
8c=320;
c=320:8;
c=40;
a=5×40;
a=200;
b=2×40;
b=80;
a+b+c=320
a=5×c b=2×c
5×c+2×c+c=320=>8×c=320=>c=40
a=5x40=200
b=2x40=80
a=5×c b=2×c
5×c+2×c+c=320=>8×c=320=>c=40
a=5x40=200
b=2x40=80