[tex]1gallon=128ounces\\To\ receive\ volume\ of\ pitcher\ in\ onces\ we\ need\ to\ multiply\ its\\volume\ in\ gallons\ by\ ounces\ in\ 1\ gallon.\\1,5g=1,5*128=192o\\Now\ to\ receive\ answer\ we\ need\ to\ divide\ volume\ of\ pitcher\ in\\ounces\ by\ volume\ of\ glass.\\192:8=24\\\\We\ need\ to\ 24\ glasses.[/tex]