In all, how many consumers did not prefer any drink?

Let's tabulate all the information from the given table:

The calculation is as follows:

Consider the male 18 - 25 range:

=> Total consumers = 600

=> Out of them, 240 like A, 180 like B, 90 like both

=> Number of people who like either = 240 + 180 - 90 = 330

=> 600 - 330 = 270 people don't like any of the drinks.

Doing the same calculation for all the categories and tabulating, we get:

Total consumers above 40 years old = 1200 + 960 = 2160; out of these, 780 + 600 = 1380 preferred none of the drinks.

=> Total number of consumers who did not prefer any drink is 270 + 90 + 780 + 480 + 240 + 600 = 2460