For one batch of the recipe:
Mix 3 teaspoons yellow water with 1 teaspoon red water
So, the ratio of teaspoons of yellow water to teaspoons of red water is 3:1
Now, we need 3 batches
so, the ratio will be
so, we need to mix 9 teaspoons yellow water with 3 teaspoon red water
The taste will be the same because the ratio 9 : 3 = 3 : 1
As the ratio is the same, the taste will be the same