Răspuns :
a=72:3=24
b=72
c=72×2=144
24+72+144+d=300
240+d=300
d=300-240
d=60
v:24+72+144+60=240+60=300
b=72
c=72×2=144
24+72+144+d=300
240+d=300
d=300-240
d=60
v:24+72+144+60=240+60=300
a+b+c+d=300
b=72 ; b=3a ; c=2b
d=?
c=2x72
c=144
b=3a => 72=3a => a=72:3 => a=24
24+72+144+d=300
240+d=300
d=300-240
d=60
Numerle sunt: a=24; b=72; c=144; d=60
verificam: 24+72+144+60=300
b=72 ; b=3a ; c=2b
d=?
c=2x72
c=144
b=3a => 72=3a => a=72:3 => a=24
24+72+144+d=300
240+d=300
d=300-240
d=60
Numerle sunt: a=24; b=72; c=144; d=60
verificam: 24+72+144+60=300