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
