there are 15 sixteenths in 15/16, how you figure this out is the numerator tells you how many are in the fraction, in this case the numerator says 15, so there are 15, sixteenths in, 15/16
I would say that it’s just 1.5 times more of the drink because the recipe calls for a 2:3 ratio but she used a 3:4 and that’s an increase of 1.5 each side, but I’m not entirely sure