Answer:
120 milkshakes was sold that day.
Explanation:
There are mistakes in the question, so below is the corrected one:

Now, to find the total number of milkshakes that the ice cream shop sold that day.
Let the total number of milkshakes sold that day be

Number of vanilla milkshakes = 48.
Rate of vanilla milkshakes of the total number of milkshakes = 40%.
Now, putting an equation to get the total number of milkshakes:




Dividing both sides by 0.40 we get:

Thus, the total number of milkshakes that the ice cream shop sold was 120.
Therefore, 120 milkshakes was sold that day.