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x-sok 10% y=sok 20%
x+y=2
0,1x+0,2y=2 * 0,16 /*10
x=2-y
x+2y=3,2
x=2-y
2-y+2y=3,2
x=2-y
y=3,2-2
x=2-y
y=1,2
x=2-1,2
y=1,2
x=0,8
y=1,2 w litrach
odp.Trzeba zmieszac 0,8l soku 10% i 1,2l soku 20%
ilość soku 20%----2-x
ilość soku 16%---2
0,1x+0,2(2-x)=0,16*2
0,1x+0,4-0,2x=0,32
-0,1x=0,32-0,4
-0,1x=-0,08/:(-0,1)
x=0,8
ilość soku 10%----0,8 litra
soku 20%-----2-0,8=1,2 litra