0.25*X+(150-X)*0.1=150*0.15

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0.25*X+(150-X)*0.1=150*0.150.25*X+(150-X)*0.1=150*0.150.25*X+(150-X)*0.1=150*0.150.25*X+(150-X)*0.1=

0.25*X+(150-X)*0.1=150*0.15
0.25*X+(150-X)*0.1=150*0.15

0.25*X+(150-X)*0.1=150*0.15
0.25*X+(150-X)*0.1=150*0.15
0.25*X+150*0.1-0.1*X=150*0.15
15+0.15*X=150*0.15
0.15*100+0.15*X=150*0.15
100+X=150
X=50

0.25*X+(150-X)*0.1=150*0.15
0.25x+15-0.1x=22.5
0.15x=7.5
x=50 .

[0.25*X+(150-X)*0.1]*100=(150*0.15)*100
25X+(150-X)*10=150*15
25X+150*10-10X=150*15
25X-10X=150*15-150*10
15X=150*5
X=150*5/15=50