let's bear in mind that 1 Cup = 8 fl oz.
a) is absolutely correct, 18oz and thus they can fit fine in the 24oz container.
b) is correct, 24 - 18 = 6, we can fit in 6 more oz, which is 3/4 of a cup.
c) is correct as well
d)
we just need to convert c) units to fluid ounces
[tex]\bf 2\frac{1}{4}\implies \cfrac{9}{4}\cdot 8\implies \boxed{18}~\hfill 3\cdot 8\implies \boxed{24} \\\\[-0.35em] ~\dotfill\\\\ \stackrel{\textit{juice}}{18}+\stackrel{\textit{water}}{12}+\stackrel{\textit{ice cream}}{24}\implies 54~\textit{fluid ounces}[/tex]
