start by looking at the (fraction)
6 / 24, or more fittingly, sparkling water / cranberry juice.
We can simplify the fraction to find an easy point of reference.
6 / 24 = 1 / 4
So if we're being asked for every one and a half cups, we'll get this fraction: 1.5 / 6.
It's about 6 cups of cranberry juice for every one and a half cups of sparkling water. Or was it the other way around? I only know the ratio, you figure out the rest.
Hope this helps!(i tried)