Question 1192851
x oz*0.15=0.15x pure
8 oz*0.20=1.6 oz pure
8+x oz of 0.19=1.52+0.19x pure
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set them equal
0.15x+1.6=0.19x+1.52
0.04x=0.08 oz
multiply by 25
x=2 oz. of 15%