Răspuns :
a+b+c =490
b =0.6a
c =0.6*0.6a =0.366a
a+0.6a + 0.36a = 490
1.96a =490
a =250
b =0.6a =0.6*250 =150
c =0.36a =0.36*250 =90
b =0.6a
c =0.6*0.6a =0.366a
a+0.6a + 0.36a = 490
1.96a =490
a =250
b =0.6a =0.6*250 =150
c =0.36a =0.36*250 =90