0.26*3+0.9X=90%

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0.26*3+0.9X=90%0.26*3+0.9X=90%0.26*3+0.9X=90%0.26*3+0.9X=90%0.78+0.9x=0.90.9x=0.12x=2/15X=2/154/30.2

0.26*3+0.9X=90%
0.26*3+0.9X=90%

0.26*3+0.9X=90%
0.26*3+0.9X=90%
0.78+0.9x=0.9
0.9x=0.12
x=2/15

X=2/15

4/3

0.26*3+0.9X=90%
0.78+0.9X=0.9
0.9X=0.9-0.78
X=0.12/0.9
X=2/15