Let x be the liquor worth 320Php ; 10-x be the liquor worth 120Php
320x + 120 (10 -x) = 310 (10)
320x + 1200 -120x = 3100
320x -120x = 3100 -1200
200x = 1900
x = 19/2 = 9.5
Therefore, she blended 9.5L of the liquor worth 320Php and 0.5L of liquor worth 120Php