[tex]The\ standard\ recipe\ is:\\\ 12\ fl\ oz\of\ orange\ juice\ concentrate\\ and\ 3\cdot 12=36\ fl\ oz\ of cold\ water\\so\ is\ 12+36=48\ fl\ oz\ of\ mix\\\\128:48=2 \frac{2}{3} \\\\Ans.\ Olivia\ need\ \ 2 \frac{2}{3}\ cans\ of\ orange\ juice\ concentrate.[/tex]