Stabilim necunoscutele: a=ceai verde sencha b=ceai negru Yunnan c=ceai alb Pai Mu Tan d=ceai verde Lung Ching e= amestec fructe uscate a+b+c+d+e=6 e=6/2<=>e=3 a=6/3+0,4<=>a=2+0,4<=>a=2,4 2,4+b+c+d+3=6 |-3 <=>2,4+b+c+d=3 |-2,4 <=> b+c+d=0,6 d=0,6/2<=>d=0,3 __ b+c+0,3=0,6 |-0,3 <=>b+c=0,3 | | => b=c _ | =>2b=0,3 /2 <=> b=0,15 <=>b=c=0,15