For three batches we will multiply the fractions by 3 3/4(3)=9/4 1/4(3)=3/4
so she will fill it once for the oats we will make the 9/4 into a mixed number, 2 1/4 she will have to fill it two whole times and a third to get the extra fourth
According to my calculations she will fill the cup four times to make all three batches of milkshake<span />